Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1 | import unittest |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 2 | from test import support |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 3 | from itertools import * |
Antoine Pitrou | 26f82ef | 2014-04-29 12:13:46 +0200 | [diff] [blame] | 4 | import weakref |
Raymond Hettinger | 8a882a7 | 2009-02-12 12:08:18 +0000 | [diff] [blame] | 5 | from decimal import Decimal |
Raymond Hettinger | de09acf | 2009-02-12 12:53:53 +0000 | [diff] [blame] | 6 | from fractions import Fraction |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 7 | import operator |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 8 | import random |
Raymond Hettinger | a3e1ad2 | 2009-11-30 22:02:31 +0000 | [diff] [blame] | 9 | import copy |
| 10 | import pickle |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 11 | from functools import reduce |
Serhiy Storchaka | 2dae92a | 2013-12-09 17:45:57 +0200 | [diff] [blame] | 12 | import sys |
| 13 | import struct |
Miss Islington (bot) | 6e3809c | 2019-09-09 02:07:51 -0700 | [diff] [blame] | 14 | import threading |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 15 | maxsize = support.MAX_Py_ssize_t |
Guido van Rossum | 360e4b8 | 2007-05-14 22:51:27 +0000 | [diff] [blame] | 16 | minsize = -maxsize-1 |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 17 | |
Guido van Rossum | 801f0d7 | 2006-08-24 19:48:10 +0000 | [diff] [blame] | 18 | def lzip(*args): |
| 19 | return list(zip(*args)) |
| 20 | |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 21 | def onearg(x): |
| 22 | 'Test function of one argument' |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 23 | return 2*x |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 24 | |
| 25 | def errfunc(*args): |
| 26 | 'Test function that raises an error' |
| 27 | raise ValueError |
| 28 | |
| 29 | def gen3(): |
| 30 | 'Non-restartable source sequence' |
| 31 | for i in (0, 1, 2): |
| 32 | yield i |
| 33 | |
| 34 | def isEven(x): |
| 35 | 'Test predicate' |
| 36 | return x%2==0 |
| 37 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 38 | def isOdd(x): |
| 39 | 'Test predicate' |
| 40 | return x%2==1 |
| 41 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 42 | def tupleize(*args): |
| 43 | return args |
| 44 | |
| 45 | def irange(n): |
| 46 | for i in range(n): |
| 47 | yield i |
| 48 | |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 49 | class StopNow: |
| 50 | 'Class emulating an empty iterable.' |
| 51 | def __iter__(self): |
| 52 | return self |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 53 | def __next__(self): |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 54 | raise StopIteration |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 55 | |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 56 | def take(n, seq): |
| 57 | 'Convenience function for partially consuming a long of infinite iterable' |
| 58 | return list(islice(seq, n)) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 59 | |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 60 | def prod(iterable): |
| 61 | return reduce(operator.mul, iterable, 1) |
| 62 | |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 63 | def fact(n): |
| 64 | 'Factorial' |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 65 | return prod(range(1, n+1)) |
| 66 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 67 | # root level methods for pickling ability |
| 68 | def testR(r): |
| 69 | return r[0] |
| 70 | |
| 71 | def testR2(r): |
| 72 | return r[2] |
| 73 | |
| 74 | def underten(x): |
| 75 | return x<10 |
| 76 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 77 | picklecopiers = [lambda s, proto=proto: pickle.loads(pickle.dumps(s, proto)) |
| 78 | for proto in range(pickle.HIGHEST_PROTOCOL + 1)] |
| 79 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 80 | class TestBasicOps(unittest.TestCase): |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 81 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 82 | def pickletest(self, protocol, it, stop=4, take=1, compare=None): |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 83 | """Test that an iterator is the same after pickling, also when part-consumed""" |
| 84 | def expand(it, i=0): |
| 85 | # Recursively expand iterables, within sensible bounds |
| 86 | if i > 10: |
| 87 | raise RuntimeError("infinite recursion encountered") |
| 88 | if isinstance(it, str): |
| 89 | return it |
| 90 | try: |
| 91 | l = list(islice(it, stop)) |
| 92 | except TypeError: |
| 93 | return it # can't expand it |
| 94 | return [expand(e, i+1) for e in l] |
| 95 | |
| 96 | # Test the initial copy against the original |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 97 | dump = pickle.dumps(it, protocol) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 98 | i2 = pickle.loads(dump) |
| 99 | self.assertEqual(type(it), type(i2)) |
| 100 | a, b = expand(it), expand(i2) |
| 101 | self.assertEqual(a, b) |
| 102 | if compare: |
| 103 | c = expand(compare) |
| 104 | self.assertEqual(a, c) |
| 105 | |
| 106 | # Take from the copy, and create another copy and compare them. |
| 107 | i3 = pickle.loads(dump) |
| 108 | took = 0 |
| 109 | try: |
| 110 | for i in range(take): |
| 111 | next(i3) |
| 112 | took += 1 |
| 113 | except StopIteration: |
| 114 | pass #in case there is less data than 'take' |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 115 | dump = pickle.dumps(i3, protocol) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 116 | i4 = pickle.loads(dump) |
| 117 | a, b = expand(i3), expand(i4) |
| 118 | self.assertEqual(a, b) |
| 119 | if compare: |
| 120 | c = expand(compare[took:]) |
| 121 | self.assertEqual(a, c); |
| 122 | |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 123 | def test_accumulate(self): |
| 124 | self.assertEqual(list(accumulate(range(10))), # one positional arg |
Raymond Hettinger | d8ff465 | 2010-12-03 02:09:34 +0000 | [diff] [blame] | 125 | [0, 1, 3, 6, 10, 15, 21, 28, 36, 45]) |
| 126 | self.assertEqual(list(accumulate(iterable=range(10))), # kw arg |
| 127 | [0, 1, 3, 6, 10, 15, 21, 28, 36, 45]) |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 128 | for typ in int, complex, Decimal, Fraction: # multiple types |
Raymond Hettinger | d8ff465 | 2010-12-03 02:09:34 +0000 | [diff] [blame] | 129 | self.assertEqual( |
| 130 | list(accumulate(map(typ, range(10)))), |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 131 | list(map(typ, [0, 1, 3, 6, 10, 15, 21, 28, 36, 45]))) |
Raymond Hettinger | 2d93e6e | 2010-12-03 02:33:53 +0000 | [diff] [blame] | 132 | self.assertEqual(list(accumulate('abc')), ['a', 'ab', 'abc']) # works with non-numeric |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 133 | self.assertEqual(list(accumulate([])), []) # empty iterable |
Raymond Hettinger | d8ff465 | 2010-12-03 02:09:34 +0000 | [diff] [blame] | 134 | self.assertEqual(list(accumulate([7])), [7]) # iterable of length one |
Raymond Hettinger | 5d44613 | 2011-03-27 18:52:10 -0700 | [diff] [blame] | 135 | self.assertRaises(TypeError, accumulate, range(10), 5, 6) # too many args |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 136 | self.assertRaises(TypeError, accumulate) # too few args |
Raymond Hettinger | d8ff465 | 2010-12-03 02:09:34 +0000 | [diff] [blame] | 137 | self.assertRaises(TypeError, accumulate, x=range(10)) # unexpected kwd arg |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 138 | self.assertRaises(TypeError, list, accumulate([1, []])) # args that don't add |
| 139 | |
Raymond Hettinger | 5d44613 | 2011-03-27 18:52:10 -0700 | [diff] [blame] | 140 | s = [2, 8, 9, 5, 7, 0, 3, 4, 1, 6] |
| 141 | self.assertEqual(list(accumulate(s, min)), |
| 142 | [2, 2, 2, 2, 2, 0, 0, 0, 0, 0]) |
| 143 | self.assertEqual(list(accumulate(s, max)), |
| 144 | [2, 8, 9, 9, 9, 9, 9, 9, 9, 9]) |
| 145 | self.assertEqual(list(accumulate(s, operator.mul)), |
| 146 | [2, 16, 144, 720, 5040, 0, 0, 0, 0, 0]) |
| 147 | with self.assertRaises(TypeError): |
| 148 | list(accumulate(s, chr)) # unary-operation |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 149 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 150 | self.pickletest(proto, accumulate(range(10))) # test pickling |
Lisa Roach | 9718b59 | 2018-09-23 17:34:59 -0700 | [diff] [blame] | 151 | self.pickletest(proto, accumulate(range(10), initial=7)) |
| 152 | self.assertEqual(list(accumulate([10, 5, 1], initial=None)), [10, 15, 16]) |
| 153 | self.assertEqual(list(accumulate([10, 5, 1], initial=100)), [100, 110, 115, 116]) |
| 154 | self.assertEqual(list(accumulate([], initial=100)), [100]) |
| 155 | with self.assertRaises(TypeError): |
| 156 | list(accumulate([10, 20], 100)) |
Raymond Hettinger | 5d44613 | 2011-03-27 18:52:10 -0700 | [diff] [blame] | 157 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 158 | def test_chain(self): |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 159 | |
| 160 | def chain2(*iterables): |
| 161 | 'Pure python version in the docs' |
| 162 | for it in iterables: |
| 163 | for element in it: |
| 164 | yield element |
| 165 | |
| 166 | for c in (chain, chain2): |
| 167 | self.assertEqual(list(c('abc', 'def')), list('abcdef')) |
| 168 | self.assertEqual(list(c('abc')), list('abc')) |
| 169 | self.assertEqual(list(c('')), []) |
| 170 | self.assertEqual(take(4, c('abc', 'def')), list('abcd')) |
| 171 | self.assertRaises(TypeError, list,c(2, 3)) |
Christian Heimes | f16baeb | 2008-02-29 14:57:44 +0000 | [diff] [blame] | 172 | |
| 173 | def test_chain_from_iterable(self): |
| 174 | self.assertEqual(list(chain.from_iterable(['abc', 'def'])), list('abcdef')) |
| 175 | self.assertEqual(list(chain.from_iterable(['abc'])), list('abc')) |
| 176 | self.assertEqual(list(chain.from_iterable([''])), []) |
| 177 | self.assertEqual(take(4, chain.from_iterable(['abc', 'def'])), list('abcd')) |
| 178 | self.assertRaises(TypeError, list, chain.from_iterable([2, 3])) |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 179 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 180 | def test_chain_reducible(self): |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 181 | for oper in [copy.deepcopy] + picklecopiers: |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 182 | it = chain('abc', 'def') |
| 183 | self.assertEqual(list(oper(it)), list('abcdef')) |
| 184 | self.assertEqual(next(it), 'a') |
| 185 | self.assertEqual(list(oper(it)), list('bcdef')) |
| 186 | |
| 187 | self.assertEqual(list(oper(chain(''))), []) |
| 188 | self.assertEqual(take(4, oper(chain('abc', 'def'))), list('abcd')) |
| 189 | self.assertRaises(TypeError, list, oper(chain(2, 3))) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 190 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 191 | self.pickletest(proto, chain('abc', 'def'), compare=list('abcdef')) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 192 | |
Serhiy Storchaka | 85c3f26 | 2016-10-02 08:34:53 +0300 | [diff] [blame] | 193 | def test_chain_setstate(self): |
| 194 | self.assertRaises(TypeError, chain().__setstate__, ()) |
| 195 | self.assertRaises(TypeError, chain().__setstate__, []) |
| 196 | self.assertRaises(TypeError, chain().__setstate__, 0) |
| 197 | self.assertRaises(TypeError, chain().__setstate__, ([],)) |
| 198 | self.assertRaises(TypeError, chain().__setstate__, (iter([]), [])) |
| 199 | it = chain() |
| 200 | it.__setstate__((iter(['abc', 'def']),)) |
| 201 | self.assertEqual(list(it), ['a', 'b', 'c', 'd', 'e', 'f']) |
| 202 | it = chain() |
| 203 | it.__setstate__((iter(['abc', 'def']), iter(['ghi']))) |
| 204 | self.assertEqual(list(it), ['ghi', 'a', 'b', 'c', 'd', 'e', 'f']) |
| 205 | |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 206 | def test_combinations(self): |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 207 | self.assertRaises(TypeError, combinations, 'abc') # missing r argument |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 208 | self.assertRaises(TypeError, combinations, 'abc', 2, 1) # too many arguments |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 209 | self.assertRaises(TypeError, combinations, None) # pool is not iterable |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 210 | self.assertRaises(ValueError, combinations, 'abc', -2) # r is negative |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 211 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 212 | for op in [lambda a:a] + picklecopiers: |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 213 | self.assertEqual(list(op(combinations('abc', 32))), []) # r > n |
| 214 | |
| 215 | self.assertEqual(list(op(combinations('ABCD', 2))), |
| 216 | [('A','B'), ('A','C'), ('A','D'), ('B','C'), ('B','D'), ('C','D')]) |
| 217 | testIntermediate = combinations('ABCD', 2) |
| 218 | next(testIntermediate) |
| 219 | self.assertEqual(list(op(testIntermediate)), |
| 220 | [('A','C'), ('A','D'), ('B','C'), ('B','D'), ('C','D')]) |
| 221 | |
| 222 | self.assertEqual(list(op(combinations(range(4), 3))), |
| 223 | [(0,1,2), (0,1,3), (0,2,3), (1,2,3)]) |
| 224 | testIntermediate = combinations(range(4), 3) |
| 225 | next(testIntermediate) |
| 226 | self.assertEqual(list(op(testIntermediate)), |
| 227 | [(0,1,3), (0,2,3), (1,2,3)]) |
| 228 | |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 229 | |
| 230 | def combinations1(iterable, r): |
| 231 | 'Pure python version shown in the docs' |
| 232 | pool = tuple(iterable) |
| 233 | n = len(pool) |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 234 | if r > n: |
| 235 | return |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 236 | indices = list(range(r)) |
| 237 | yield tuple(pool[i] for i in indices) |
| 238 | while 1: |
| 239 | for i in reversed(range(r)): |
| 240 | if indices[i] != i + n - r: |
| 241 | break |
| 242 | else: |
| 243 | return |
| 244 | indices[i] += 1 |
| 245 | for j in range(i+1, r): |
| 246 | indices[j] = indices[j-1] + 1 |
| 247 | yield tuple(pool[i] for i in indices) |
| 248 | |
| 249 | def combinations2(iterable, r): |
| 250 | 'Pure python version shown in the docs' |
| 251 | pool = tuple(iterable) |
| 252 | n = len(pool) |
| 253 | for indices in permutations(range(n), r): |
| 254 | if sorted(indices) == list(indices): |
| 255 | yield tuple(pool[i] for i in indices) |
| 256 | |
Raymond Hettinger | eb508ad | 2009-01-27 09:35:21 +0000 | [diff] [blame] | 257 | def combinations3(iterable, r): |
| 258 | 'Pure python version from cwr()' |
| 259 | pool = tuple(iterable) |
| 260 | n = len(pool) |
| 261 | for indices in combinations_with_replacement(range(n), r): |
| 262 | if len(set(indices)) == r: |
| 263 | yield tuple(pool[i] for i in indices) |
| 264 | |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 265 | for n in range(7): |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 266 | values = [5*x-12 for x in range(n)] |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 267 | for r in range(n+2): |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 268 | result = list(combinations(values, r)) |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 269 | self.assertEqual(len(result), 0 if r>n else fact(n) / fact(r) / fact(n-r)) # right number of combs |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 270 | self.assertEqual(len(result), len(set(result))) # no repeats |
| 271 | self.assertEqual(result, sorted(result)) # lexicographic order |
| 272 | for c in result: |
| 273 | self.assertEqual(len(c), r) # r-length combinations |
| 274 | self.assertEqual(len(set(c)), r) # no duplicate elements |
| 275 | self.assertEqual(list(c), sorted(c)) # keep original ordering |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 276 | self.assertTrue(all(e in values for e in c)) # elements taken from input iterable |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 277 | self.assertEqual(list(c), |
| 278 | [e for e in values if e in c]) # comb is a subsequence of the input iterable |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 279 | self.assertEqual(result, list(combinations1(values, r))) # matches first pure python version |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 280 | self.assertEqual(result, list(combinations2(values, r))) # matches second pure python version |
Raymond Hettinger | eb508ad | 2009-01-27 09:35:21 +0000 | [diff] [blame] | 281 | self.assertEqual(result, list(combinations3(values, r))) # matches second pure python version |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 282 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 283 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 284 | self.pickletest(proto, combinations(values, r)) # test pickling |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 285 | |
Benjamin Peterson | 4b40eeb | 2015-02-01 20:59:00 -0500 | [diff] [blame] | 286 | @support.bigaddrspacetest |
| 287 | def test_combinations_overflow(self): |
Serhiy Storchaka | dee948b | 2015-02-03 01:34:09 +0200 | [diff] [blame] | 288 | with self.assertRaises((OverflowError, MemoryError)): |
Benjamin Peterson | 4b40eeb | 2015-02-01 20:59:00 -0500 | [diff] [blame] | 289 | combinations("AA", 2**29) |
| 290 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 291 | # Test implementation detail: tuple re-use |
Alex Gaynor | e151d21 | 2011-07-17 16:21:30 -0700 | [diff] [blame] | 292 | @support.impl_detail("tuple reuse is specific to CPython") |
| 293 | def test_combinations_tuple_reuse(self): |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 294 | self.assertEqual(len(set(map(id, combinations('abcde', 3)))), 1) |
| 295 | self.assertNotEqual(len(set(map(id, list(combinations('abcde', 3))))), 1) |
| 296 | |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 297 | def test_combinations_with_replacement(self): |
| 298 | cwr = combinations_with_replacement |
| 299 | self.assertRaises(TypeError, cwr, 'abc') # missing r argument |
| 300 | self.assertRaises(TypeError, cwr, 'abc', 2, 1) # too many arguments |
| 301 | self.assertRaises(TypeError, cwr, None) # pool is not iterable |
| 302 | self.assertRaises(ValueError, cwr, 'abc', -2) # r is negative |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 303 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 304 | for op in [lambda a:a] + picklecopiers: |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 305 | self.assertEqual(list(op(cwr('ABC', 2))), |
| 306 | [('A','A'), ('A','B'), ('A','C'), ('B','B'), ('B','C'), ('C','C')]) |
| 307 | testIntermediate = cwr('ABC', 2) |
| 308 | next(testIntermediate) |
| 309 | self.assertEqual(list(op(testIntermediate)), |
| 310 | [('A','B'), ('A','C'), ('B','B'), ('B','C'), ('C','C')]) |
| 311 | |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 312 | |
| 313 | def cwr1(iterable, r): |
| 314 | 'Pure python version shown in the docs' |
| 315 | # number items returned: (n+r-1)! / r! / (n-1)! when n>0 |
| 316 | pool = tuple(iterable) |
| 317 | n = len(pool) |
| 318 | if not n and r: |
| 319 | return |
| 320 | indices = [0] * r |
| 321 | yield tuple(pool[i] for i in indices) |
| 322 | while 1: |
| 323 | for i in reversed(range(r)): |
| 324 | if indices[i] != n - 1: |
| 325 | break |
| 326 | else: |
| 327 | return |
| 328 | indices[i:] = [indices[i] + 1] * (r - i) |
| 329 | yield tuple(pool[i] for i in indices) |
| 330 | |
| 331 | def cwr2(iterable, r): |
| 332 | 'Pure python version shown in the docs' |
| 333 | pool = tuple(iterable) |
| 334 | n = len(pool) |
| 335 | for indices in product(range(n), repeat=r): |
| 336 | if sorted(indices) == list(indices): |
| 337 | yield tuple(pool[i] for i in indices) |
| 338 | |
| 339 | def numcombs(n, r): |
| 340 | if not n: |
| 341 | return 0 if r else 1 |
| 342 | return fact(n+r-1) / fact(r)/ fact(n-1) |
| 343 | |
| 344 | for n in range(7): |
| 345 | values = [5*x-12 for x in range(n)] |
| 346 | for r in range(n+2): |
| 347 | result = list(cwr(values, r)) |
| 348 | |
| 349 | self.assertEqual(len(result), numcombs(n, r)) # right number of combs |
| 350 | self.assertEqual(len(result), len(set(result))) # no repeats |
| 351 | self.assertEqual(result, sorted(result)) # lexicographic order |
| 352 | |
| 353 | regular_combs = list(combinations(values, r)) # compare to combs without replacement |
| 354 | if n == 0 or r <= 1: |
Ezio Melotti | b3aedd4 | 2010-11-20 19:04:17 +0000 | [diff] [blame] | 355 | self.assertEqual(result, regular_combs) # cases that should be identical |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 356 | else: |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 357 | self.assertTrue(set(result) >= set(regular_combs)) # rest should be supersets of regular combs |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 358 | |
| 359 | for c in result: |
| 360 | self.assertEqual(len(c), r) # r-length combinations |
| 361 | noruns = [k for k,v in groupby(c)] # combo without consecutive repeats |
| 362 | self.assertEqual(len(noruns), len(set(noruns))) # no repeats other than consecutive |
| 363 | self.assertEqual(list(c), sorted(c)) # keep original ordering |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 364 | self.assertTrue(all(e in values for e in c)) # elements taken from input iterable |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 365 | self.assertEqual(noruns, |
| 366 | [e for e in values if e in c]) # comb is a subsequence of the input iterable |
| 367 | self.assertEqual(result, list(cwr1(values, r))) # matches first pure python version |
| 368 | self.assertEqual(result, list(cwr2(values, r))) # matches second pure python version |
| 369 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 370 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 371 | self.pickletest(proto, cwr(values,r)) # test pickling |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 372 | |
Benjamin Peterson | 6f08229 | 2015-02-01 21:10:47 -0500 | [diff] [blame] | 373 | @support.bigaddrspacetest |
| 374 | def test_combinations_with_replacement_overflow(self): |
Serhiy Storchaka | dee948b | 2015-02-03 01:34:09 +0200 | [diff] [blame] | 375 | with self.assertRaises((OverflowError, MemoryError)): |
Benjamin Peterson | 6f08229 | 2015-02-01 21:10:47 -0500 | [diff] [blame] | 376 | combinations_with_replacement("AA", 2**30) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 377 | |
Benjamin Peterson | 6f08229 | 2015-02-01 21:10:47 -0500 | [diff] [blame] | 378 | # Test implementation detail: tuple re-use |
Alex Gaynor | e151d21 | 2011-07-17 16:21:30 -0700 | [diff] [blame] | 379 | @support.impl_detail("tuple reuse is specific to CPython") |
| 380 | def test_combinations_with_replacement_tuple_reuse(self): |
| 381 | cwr = combinations_with_replacement |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 382 | self.assertEqual(len(set(map(id, cwr('abcde', 3)))), 1) |
| 383 | self.assertNotEqual(len(set(map(id, list(cwr('abcde', 3))))), 1) |
| 384 | |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 385 | def test_permutations(self): |
| 386 | self.assertRaises(TypeError, permutations) # too few arguments |
| 387 | self.assertRaises(TypeError, permutations, 'abc', 2, 1) # too many arguments |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 388 | self.assertRaises(TypeError, permutations, None) # pool is not iterable |
| 389 | self.assertRaises(ValueError, permutations, 'abc', -2) # r is negative |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 390 | self.assertEqual(list(permutations('abc', 32)), []) # r > n |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 391 | self.assertRaises(TypeError, permutations, 'abc', 's') # r is not an int or None |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 392 | self.assertEqual(list(permutations(range(3), 2)), |
| 393 | [(0,1), (0,2), (1,0), (1,2), (2,0), (2,1)]) |
| 394 | |
| 395 | def permutations1(iterable, r=None): |
| 396 | 'Pure python version shown in the docs' |
| 397 | pool = tuple(iterable) |
| 398 | n = len(pool) |
| 399 | r = n if r is None else r |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 400 | if r > n: |
| 401 | return |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 402 | indices = list(range(n)) |
| 403 | cycles = list(range(n-r+1, n+1))[::-1] |
| 404 | yield tuple(pool[i] for i in indices[:r]) |
| 405 | while n: |
| 406 | for i in reversed(range(r)): |
| 407 | cycles[i] -= 1 |
| 408 | if cycles[i] == 0: |
| 409 | indices[i:] = indices[i+1:] + indices[i:i+1] |
| 410 | cycles[i] = n - i |
| 411 | else: |
| 412 | j = cycles[i] |
| 413 | indices[i], indices[-j] = indices[-j], indices[i] |
| 414 | yield tuple(pool[i] for i in indices[:r]) |
| 415 | break |
| 416 | else: |
| 417 | return |
| 418 | |
| 419 | def permutations2(iterable, r=None): |
| 420 | 'Pure python version shown in the docs' |
| 421 | pool = tuple(iterable) |
| 422 | n = len(pool) |
| 423 | r = n if r is None else r |
| 424 | for indices in product(range(n), repeat=r): |
| 425 | if len(set(indices)) == r: |
| 426 | yield tuple(pool[i] for i in indices) |
| 427 | |
| 428 | for n in range(7): |
| 429 | values = [5*x-12 for x in range(n)] |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 430 | for r in range(n+2): |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 431 | result = list(permutations(values, r)) |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 432 | self.assertEqual(len(result), 0 if r>n else fact(n) / fact(n-r)) # right number of perms |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 433 | self.assertEqual(len(result), len(set(result))) # no repeats |
| 434 | self.assertEqual(result, sorted(result)) # lexicographic order |
| 435 | for p in result: |
| 436 | self.assertEqual(len(p), r) # r-length permutations |
| 437 | self.assertEqual(len(set(p)), r) # no duplicate elements |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 438 | self.assertTrue(all(e in values for e in p)) # elements taken from input iterable |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 439 | self.assertEqual(result, list(permutations1(values, r))) # matches first pure python version |
Raymond Hettinger | 5bad41e | 2009-01-08 21:01:54 +0000 | [diff] [blame] | 440 | self.assertEqual(result, list(permutations2(values, r))) # matches second pure python version |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 441 | if r == n: |
| 442 | self.assertEqual(result, list(permutations(values, None))) # test r as None |
| 443 | self.assertEqual(result, list(permutations(values))) # test default r |
| 444 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 445 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 446 | self.pickletest(proto, permutations(values, r)) # test pickling |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 447 | |
Benjamin Peterson | 0eaabf1 | 2015-02-01 21:34:07 -0500 | [diff] [blame] | 448 | @support.bigaddrspacetest |
| 449 | def test_permutations_overflow(self): |
Serhiy Storchaka | dee948b | 2015-02-03 01:34:09 +0200 | [diff] [blame] | 450 | with self.assertRaises((OverflowError, MemoryError)): |
Benjamin Peterson | 0eaabf1 | 2015-02-01 21:34:07 -0500 | [diff] [blame] | 451 | permutations("A", 2**30) |
Benjamin Peterson | 0eaabf1 | 2015-02-01 21:34:07 -0500 | [diff] [blame] | 452 | |
Zachary Ware | dca807b | 2014-04-24 13:22:05 -0500 | [diff] [blame] | 453 | @support.impl_detail("tuple reuse is specific to CPython") |
Alex Gaynor | e151d21 | 2011-07-17 16:21:30 -0700 | [diff] [blame] | 454 | def test_permutations_tuple_reuse(self): |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 455 | self.assertEqual(len(set(map(id, permutations('abcde', 3)))), 1) |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 456 | self.assertNotEqual(len(set(map(id, list(permutations('abcde', 3))))), 1) |
Christian Heimes | 380f7f2 | 2008-02-28 11:19:05 +0000 | [diff] [blame] | 457 | |
Raymond Hettinger | eb508ad | 2009-01-27 09:35:21 +0000 | [diff] [blame] | 458 | def test_combinatorics(self): |
| 459 | # Test relationships between product(), permutations(), |
| 460 | # combinations() and combinations_with_replacement(). |
| 461 | |
Raymond Hettinger | da6bc52 | 2009-01-27 10:39:42 +0000 | [diff] [blame] | 462 | for n in range(6): |
| 463 | s = 'ABCDEFG'[:n] |
| 464 | for r in range(8): |
| 465 | prod = list(product(s, repeat=r)) |
| 466 | cwr = list(combinations_with_replacement(s, r)) |
| 467 | perm = list(permutations(s, r)) |
| 468 | comb = list(combinations(s, r)) |
Raymond Hettinger | eb508ad | 2009-01-27 09:35:21 +0000 | [diff] [blame] | 469 | |
Raymond Hettinger | da6bc52 | 2009-01-27 10:39:42 +0000 | [diff] [blame] | 470 | # Check size |
Ezio Melotti | b3aedd4 | 2010-11-20 19:04:17 +0000 | [diff] [blame] | 471 | self.assertEqual(len(prod), n**r) |
| 472 | self.assertEqual(len(cwr), (fact(n+r-1) / fact(r)/ fact(n-1)) if n else (not r)) |
| 473 | self.assertEqual(len(perm), 0 if r>n else fact(n) / fact(n-r)) |
| 474 | self.assertEqual(len(comb), 0 if r>n else fact(n) / fact(r) / fact(n-r)) |
Raymond Hettinger | da6bc52 | 2009-01-27 10:39:42 +0000 | [diff] [blame] | 475 | |
| 476 | # Check lexicographic order without repeated tuples |
Ezio Melotti | b3aedd4 | 2010-11-20 19:04:17 +0000 | [diff] [blame] | 477 | self.assertEqual(prod, sorted(set(prod))) |
| 478 | self.assertEqual(cwr, sorted(set(cwr))) |
| 479 | self.assertEqual(perm, sorted(set(perm))) |
| 480 | self.assertEqual(comb, sorted(set(comb))) |
Raymond Hettinger | da6bc52 | 2009-01-27 10:39:42 +0000 | [diff] [blame] | 481 | |
| 482 | # Check interrelationships |
Ezio Melotti | b3aedd4 | 2010-11-20 19:04:17 +0000 | [diff] [blame] | 483 | self.assertEqual(cwr, [t for t in prod if sorted(t)==list(t)]) # cwr: prods which are sorted |
| 484 | self.assertEqual(perm, [t for t in prod if len(set(t))==r]) # perm: prods with no dups |
Raymond Hettinger | da6bc52 | 2009-01-27 10:39:42 +0000 | [diff] [blame] | 485 | self.assertEqual(comb, [t for t in perm if sorted(t)==list(t)]) # comb: perms that are sorted |
| 486 | self.assertEqual(comb, [t for t in cwr if len(set(t))==r]) # comb: cwrs without dups |
| 487 | self.assertEqual(comb, list(filter(set(cwr).__contains__, perm))) # comb: perm that is a cwr |
| 488 | self.assertEqual(comb, list(filter(set(perm).__contains__, cwr))) # comb: cwr that is a perm |
| 489 | self.assertEqual(comb, sorted(set(cwr) & set(perm))) # comb: both a cwr and a perm |
Raymond Hettinger | eb508ad | 2009-01-27 09:35:21 +0000 | [diff] [blame] | 490 | |
Raymond Hettinger | 6b3b0fc | 2009-01-26 02:56:58 +0000 | [diff] [blame] | 491 | def test_compress(self): |
Raymond Hettinger | 15a4950 | 2009-02-19 02:17:09 +0000 | [diff] [blame] | 492 | self.assertEqual(list(compress(data='ABCDEF', selectors=[1,0,1,0,1,1])), list('ACEF')) |
Raymond Hettinger | 6b3b0fc | 2009-01-26 02:56:58 +0000 | [diff] [blame] | 493 | self.assertEqual(list(compress('ABCDEF', [1,0,1,0,1,1])), list('ACEF')) |
| 494 | self.assertEqual(list(compress('ABCDEF', [0,0,0,0,0,0])), list('')) |
| 495 | self.assertEqual(list(compress('ABCDEF', [1,1,1,1,1,1])), list('ABCDEF')) |
| 496 | self.assertEqual(list(compress('ABCDEF', [1,0,1])), list('AC')) |
| 497 | self.assertEqual(list(compress('ABC', [0,1,1,1,1,1])), list('BC')) |
| 498 | n = 10000 |
| 499 | data = chain.from_iterable(repeat(range(6), n)) |
| 500 | selectors = chain.from_iterable(repeat((0, 1))) |
| 501 | self.assertEqual(list(compress(data, selectors)), [1,3,5] * n) |
| 502 | self.assertRaises(TypeError, compress, None, range(6)) # 1st arg not iterable |
| 503 | self.assertRaises(TypeError, compress, range(6), None) # 2nd arg not iterable |
| 504 | self.assertRaises(TypeError, compress, range(6)) # too few args |
| 505 | self.assertRaises(TypeError, compress, range(6), None) # too many args |
| 506 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 507 | # check copy, deepcopy, pickle |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 508 | for op in [lambda a:copy.copy(a), lambda a:copy.deepcopy(a)] + picklecopiers: |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 509 | for data, selectors, result1, result2 in [ |
| 510 | ('ABCDEF', [1,0,1,0,1,1], 'ACEF', 'CEF'), |
| 511 | ('ABCDEF', [0,0,0,0,0,0], '', ''), |
| 512 | ('ABCDEF', [1,1,1,1,1,1], 'ABCDEF', 'BCDEF'), |
| 513 | ('ABCDEF', [1,0,1], 'AC', 'C'), |
| 514 | ('ABC', [0,1,1,1,1,1], 'BC', 'C'), |
| 515 | ]: |
| 516 | |
| 517 | self.assertEqual(list(op(compress(data=data, selectors=selectors))), list(result1)) |
| 518 | self.assertEqual(list(op(compress(data, selectors))), list(result1)) |
| 519 | testIntermediate = compress(data, selectors) |
| 520 | if result1: |
| 521 | next(testIntermediate) |
| 522 | self.assertEqual(list(op(testIntermediate)), list(result2)) |
| 523 | |
| 524 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 525 | def test_count(self): |
Guido van Rossum | 801f0d7 | 2006-08-24 19:48:10 +0000 | [diff] [blame] | 526 | self.assertEqual(lzip('abc',count()), [('a', 0), ('b', 1), ('c', 2)]) |
| 527 | self.assertEqual(lzip('abc',count(3)), [('a', 3), ('b', 4), ('c', 5)]) |
| 528 | self.assertEqual(take(2, lzip('abc',count(3))), [('a', 3), ('b', 4)]) |
Guido van Rossum | 8ce8a78 | 2007-11-01 19:42:39 +0000 | [diff] [blame] | 529 | self.assertEqual(take(2, zip('abc',count(-1))), [('a', -1), ('b', 0)]) |
| 530 | self.assertEqual(take(2, zip('abc',count(-3))), [('a', -3), ('b', -2)]) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 531 | self.assertRaises(TypeError, count, 2, 3, 4) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 532 | self.assertRaises(TypeError, count, 'a') |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 533 | self.assertEqual(take(10, count(maxsize-5)), |
Guido van Rossum | 8ce8a78 | 2007-11-01 19:42:39 +0000 | [diff] [blame] | 534 | list(range(maxsize-5, maxsize+5))) |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 535 | self.assertEqual(take(10, count(-maxsize-5)), |
Guido van Rossum | 8ce8a78 | 2007-11-01 19:42:39 +0000 | [diff] [blame] | 536 | list(range(-maxsize-5, -maxsize+5))) |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 537 | self.assertEqual(take(3, count(3.25)), [3.25, 4.25, 5.25]) |
| 538 | self.assertEqual(take(3, count(3.25-4j)), [3.25-4j, 4.25-4j, 5.25-4j]) |
| 539 | self.assertEqual(take(3, count(Decimal('1.1'))), |
| 540 | [Decimal('1.1'), Decimal('2.1'), Decimal('3.1')]) |
| 541 | self.assertEqual(take(3, count(Fraction(2, 3))), |
| 542 | [Fraction(2, 3), Fraction(5, 3), Fraction(8, 3)]) |
| 543 | BIGINT = 1<<1000 |
| 544 | self.assertEqual(take(3, count(BIGINT)), [BIGINT, BIGINT+1, BIGINT+2]) |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 545 | c = count(3) |
| 546 | self.assertEqual(repr(c), 'count(3)') |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 547 | next(c) |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 548 | self.assertEqual(repr(c), 'count(4)') |
Thomas Wouters | 89f507f | 2006-12-13 04:49:30 +0000 | [diff] [blame] | 549 | c = count(-9) |
| 550 | self.assertEqual(repr(c), 'count(-9)') |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 551 | next(c) |
| 552 | self.assertEqual(next(c), -8) |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 553 | self.assertEqual(repr(count(10.25)), 'count(10.25)') |
| 554 | self.assertEqual(repr(count(10.0)), 'count(10.0)') |
| 555 | self.assertEqual(type(next(count(10.0))), float) |
Christian Heimes | a37d4c6 | 2007-12-04 23:02:19 +0000 | [diff] [blame] | 556 | for i in (-sys.maxsize-5, -sys.maxsize+5 ,-10, -1, 0, 10, sys.maxsize-5, sys.maxsize+5): |
Serhiy Storchaka | 9594942 | 2013-08-27 19:40:23 +0300 | [diff] [blame] | 557 | # Test repr |
| 558 | r1 = repr(count(i)) |
| 559 | r2 = 'count(%r)'.__mod__(i) |
Guido van Rossum | 8ce8a78 | 2007-11-01 19:42:39 +0000 | [diff] [blame] | 560 | self.assertEqual(r1, r2) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 561 | |
Raymond Hettinger | a3e1ad2 | 2009-11-30 22:02:31 +0000 | [diff] [blame] | 562 | # check copy, deepcopy, pickle |
| 563 | for value in -3, 3, maxsize-5, maxsize+5: |
| 564 | c = count(value) |
| 565 | self.assertEqual(next(copy.copy(c)), value) |
| 566 | self.assertEqual(next(copy.deepcopy(c)), value) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 567 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 568 | self.pickletest(proto, count(value)) |
Raymond Hettinger | a3e1ad2 | 2009-11-30 22:02:31 +0000 | [diff] [blame] | 569 | |
Kristjan Valur Jonsson | 35722a9 | 2011-03-30 11:04:28 +0000 | [diff] [blame] | 570 | #check proper internal error handling for large "step' sizes |
| 571 | count(1, maxsize+5); sys.exc_info() |
| 572 | |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 573 | def test_count_with_stride(self): |
| 574 | self.assertEqual(lzip('abc',count(2,3)), [('a', 2), ('b', 5), ('c', 8)]) |
Raymond Hettinger | eb13fdd | 2009-02-21 22:30:12 +0000 | [diff] [blame] | 575 | self.assertEqual(lzip('abc',count(start=2,step=3)), |
| 576 | [('a', 2), ('b', 5), ('c', 8)]) |
| 577 | self.assertEqual(lzip('abc',count(step=-1)), |
| 578 | [('a', 0), ('b', -1), ('c', -2)]) |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 579 | self.assertRaises(TypeError, count, 'a', 'b') |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 580 | self.assertEqual(lzip('abc',count(2,0)), [('a', 2), ('b', 2), ('c', 2)]) |
| 581 | self.assertEqual(lzip('abc',count(2,1)), [('a', 2), ('b', 3), ('c', 4)]) |
Raymond Hettinger | 9e8dbbc | 2009-02-14 04:21:49 +0000 | [diff] [blame] | 582 | self.assertEqual(lzip('abc',count(2,3)), [('a', 2), ('b', 5), ('c', 8)]) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 583 | self.assertEqual(take(20, count(maxsize-15, 3)), take(20, range(maxsize-15, maxsize+100, 3))) |
| 584 | self.assertEqual(take(20, count(-maxsize-15, 3)), take(20, range(-maxsize-15,-maxsize+100, 3))) |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 585 | self.assertEqual(take(3, count(10, maxsize+5)), |
| 586 | list(range(10, 10+3*(maxsize+5), maxsize+5))) |
| 587 | self.assertEqual(take(3, count(2, 1.25)), [2, 3.25, 4.5]) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 588 | self.assertEqual(take(3, count(2, 3.25-4j)), [2, 5.25-4j, 8.5-8j]) |
Raymond Hettinger | 8a882a7 | 2009-02-12 12:08:18 +0000 | [diff] [blame] | 589 | self.assertEqual(take(3, count(Decimal('1.1'), Decimal('.1'))), |
| 590 | [Decimal('1.1'), Decimal('1.2'), Decimal('1.3')]) |
Raymond Hettinger | de09acf | 2009-02-12 12:53:53 +0000 | [diff] [blame] | 591 | self.assertEqual(take(3, count(Fraction(2,3), Fraction(1,7))), |
| 592 | [Fraction(2,3), Fraction(17,21), Fraction(20,21)]) |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 593 | BIGINT = 1<<1000 |
| 594 | self.assertEqual(take(3, count(step=BIGINT)), [0, BIGINT, 2*BIGINT]) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 595 | self.assertEqual(repr(take(3, count(10, 2.5))), repr([10, 12.5, 15.0])) |
| 596 | c = count(3, 5) |
| 597 | self.assertEqual(repr(c), 'count(3, 5)') |
| 598 | next(c) |
| 599 | self.assertEqual(repr(c), 'count(8, 5)') |
| 600 | c = count(-9, 0) |
| 601 | self.assertEqual(repr(c), 'count(-9, 0)') |
| 602 | next(c) |
| 603 | self.assertEqual(repr(c), 'count(-9, 0)') |
| 604 | c = count(-9, -3) |
| 605 | self.assertEqual(repr(c), 'count(-9, -3)') |
| 606 | next(c) |
| 607 | self.assertEqual(repr(c), 'count(-12, -3)') |
| 608 | self.assertEqual(repr(c), 'count(-12, -3)') |
| 609 | self.assertEqual(repr(count(10.5, 1.25)), 'count(10.5, 1.25)') |
| 610 | self.assertEqual(repr(count(10.5, 1)), 'count(10.5)') # suppress step=1 when it's an int |
| 611 | self.assertEqual(repr(count(10.5, 1.00)), 'count(10.5, 1.0)') # do show float values lilke 1.0 |
Serhiy Storchaka | 8ddcf3a | 2016-09-10 09:49:24 +0300 | [diff] [blame] | 612 | self.assertEqual(repr(count(10, 1.00)), 'count(10, 1.0)') |
| 613 | c = count(10, 1.0) |
| 614 | self.assertEqual(type(next(c)), int) |
| 615 | self.assertEqual(type(next(c)), float) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 616 | for i in (-sys.maxsize-5, -sys.maxsize+5 ,-10, -1, 0, 10, sys.maxsize-5, sys.maxsize+5): |
| 617 | for j in (-sys.maxsize-5, -sys.maxsize+5 ,-10, -1, 0, 1, 10, sys.maxsize-5, sys.maxsize+5): |
Serhiy Storchaka | 9594942 | 2013-08-27 19:40:23 +0300 | [diff] [blame] | 618 | # Test repr |
| 619 | r1 = repr(count(i, j)) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 620 | if j == 1: |
Serhiy Storchaka | 9594942 | 2013-08-27 19:40:23 +0300 | [diff] [blame] | 621 | r2 = ('count(%r)' % i) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 622 | else: |
Serhiy Storchaka | 9594942 | 2013-08-27 19:40:23 +0300 | [diff] [blame] | 623 | r2 = ('count(%r, %r)' % (i, j)) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 624 | self.assertEqual(r1, r2) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 625 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 626 | self.pickletest(proto, count(i, j)) |
Raymond Hettinger | 3072921 | 2009-02-12 06:28:27 +0000 | [diff] [blame] | 627 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 628 | def test_cycle(self): |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 629 | self.assertEqual(take(10, cycle('abc')), list('abcabcabca')) |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 630 | self.assertEqual(list(cycle('')), []) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 631 | self.assertRaises(TypeError, cycle) |
| 632 | self.assertRaises(TypeError, cycle, 5) |
| 633 | self.assertEqual(list(islice(cycle(gen3()),10)), [0,1,2,0,1,2,0,1,2,0]) |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 634 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 635 | # check copy, deepcopy, pickle |
| 636 | c = cycle('abc') |
| 637 | self.assertEqual(next(c), 'a') |
| 638 | #simple copy currently not supported, because __reduce__ returns |
| 639 | #an internal iterator |
| 640 | #self.assertEqual(take(10, copy.copy(c)), list('bcabcabcab')) |
| 641 | self.assertEqual(take(10, copy.deepcopy(c)), list('bcabcabcab')) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 642 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 643 | self.assertEqual(take(10, pickle.loads(pickle.dumps(c, proto))), |
| 644 | list('bcabcabcab')) |
| 645 | next(c) |
| 646 | self.assertEqual(take(10, pickle.loads(pickle.dumps(c, proto))), |
| 647 | list('cabcabcabc')) |
| 648 | next(c) |
| 649 | next(c) |
| 650 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 651 | self.pickletest(proto, cycle('abc')) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 652 | |
Raymond Hettinger | a166ce5 | 2015-08-15 14:45:49 -0700 | [diff] [blame] | 653 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 654 | # test with partial consumed input iterable |
| 655 | it = iter('abcde') |
| 656 | c = cycle(it) |
Raymond Hettinger | 1cadf76 | 2015-08-15 14:47:27 -0700 | [diff] [blame] | 657 | _ = [next(c) for i in range(2)] # consume 2 of 5 inputs |
Raymond Hettinger | a166ce5 | 2015-08-15 14:45:49 -0700 | [diff] [blame] | 658 | p = pickle.dumps(c, proto) |
| 659 | d = pickle.loads(p) # rebuild the cycle object |
| 660 | self.assertEqual(take(20, d), list('cdeabcdeabcdeabcdeab')) |
| 661 | |
| 662 | # test with completely consumed input iterable |
| 663 | it = iter('abcde') |
| 664 | c = cycle(it) |
Raymond Hettinger | 1cadf76 | 2015-08-15 14:47:27 -0700 | [diff] [blame] | 665 | _ = [next(c) for i in range(7)] # consume 7 of 5 inputs |
Raymond Hettinger | a166ce5 | 2015-08-15 14:45:49 -0700 | [diff] [blame] | 666 | p = pickle.dumps(c, proto) |
| 667 | d = pickle.loads(p) # rebuild the cycle object |
| 668 | self.assertEqual(take(20, d), list('cdeabcdeabcdeabcdeab')) |
| 669 | |
Raymond Hettinger | 79c878d | 2015-08-15 13:51:59 -0700 | [diff] [blame] | 670 | def test_cycle_setstate(self): |
| 671 | # Verify both modes for restoring state |
| 672 | |
| 673 | # Mode 0 is efficient. It uses an incompletely consumed input |
| 674 | # iterator to build a cycle object and then passes in state with |
| 675 | # a list of previously consumed values. There is no data |
Martin Panter | f157982 | 2016-05-26 06:03:33 +0000 | [diff] [blame] | 676 | # overlap between the two. |
Raymond Hettinger | 79c878d | 2015-08-15 13:51:59 -0700 | [diff] [blame] | 677 | c = cycle('defg') |
| 678 | c.__setstate__((list('abc'), 0)) |
| 679 | self.assertEqual(take(20, c), list('defgabcdefgabcdefgab')) |
| 680 | |
| 681 | # Mode 1 is inefficient. It starts with a cycle object built |
| 682 | # from an iterator over the remaining elements in a partial |
| 683 | # cycle and then passes in state with all of the previously |
| 684 | # seen values (this overlaps values included in the iterator). |
| 685 | c = cycle('defg') |
| 686 | c.__setstate__((list('abcdefg'), 1)) |
| 687 | self.assertEqual(take(20, c), list('defgabcdefgabcdefgab')) |
| 688 | |
| 689 | # The first argument to setstate needs to be a tuple |
Serhiy Storchaka | 8f0f205 | 2016-10-02 09:13:14 +0300 | [diff] [blame] | 690 | with self.assertRaises(TypeError): |
Raymond Hettinger | 79c878d | 2015-08-15 13:51:59 -0700 | [diff] [blame] | 691 | cycle('defg').__setstate__([list('abcdefg'), 0]) |
| 692 | |
| 693 | # The first argument in the setstate tuple must be a list |
| 694 | with self.assertRaises(TypeError): |
| 695 | c = cycle('defg') |
Serhiy Storchaka | 8f0f205 | 2016-10-02 09:13:14 +0300 | [diff] [blame] | 696 | c.__setstate__((tuple('defg'), 0)) |
| 697 | take(20, c) |
Raymond Hettinger | 79c878d | 2015-08-15 13:51:59 -0700 | [diff] [blame] | 698 | |
Serhiy Storchaka | 8f0f205 | 2016-10-02 09:13:14 +0300 | [diff] [blame] | 699 | # The second argument in the setstate tuple must be an int |
Raymond Hettinger | 79c878d | 2015-08-15 13:51:59 -0700 | [diff] [blame] | 700 | with self.assertRaises(TypeError): |
| 701 | cycle('defg').__setstate__((list('abcdefg'), 'x')) |
| 702 | |
Serhiy Storchaka | 85c3f26 | 2016-10-02 08:34:53 +0300 | [diff] [blame] | 703 | self.assertRaises(TypeError, cycle('').__setstate__, ()) |
Serhiy Storchaka | 85c3f26 | 2016-10-02 08:34:53 +0300 | [diff] [blame] | 704 | self.assertRaises(TypeError, cycle('').__setstate__, ([],)) |
Serhiy Storchaka | 85c3f26 | 2016-10-02 08:34:53 +0300 | [diff] [blame] | 705 | |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 706 | def test_groupby(self): |
| 707 | # Check whether it accepts arguments correctly |
| 708 | self.assertEqual([], list(groupby([]))) |
| 709 | self.assertEqual([], list(groupby([], key=id))) |
| 710 | self.assertRaises(TypeError, list, groupby('abc', [])) |
| 711 | self.assertRaises(TypeError, groupby, None) |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 712 | self.assertRaises(TypeError, groupby, 'abc', lambda x:x, 10) |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 713 | |
| 714 | # Check normal input |
| 715 | s = [(0, 10, 20), (0, 11,21), (0,12,21), (1,13,21), (1,14,22), |
| 716 | (2,15,22), (3,16,23), (3,17,23)] |
| 717 | dup = [] |
| 718 | for k, g in groupby(s, lambda r:r[0]): |
| 719 | for elem in g: |
| 720 | self.assertEqual(k, elem[0]) |
| 721 | dup.append(elem) |
| 722 | self.assertEqual(s, dup) |
| 723 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 724 | # Check normal pickled |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 725 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 726 | dup = [] |
| 727 | for k, g in pickle.loads(pickle.dumps(groupby(s, testR), proto)): |
| 728 | for elem in g: |
| 729 | self.assertEqual(k, elem[0]) |
| 730 | dup.append(elem) |
| 731 | self.assertEqual(s, dup) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 732 | |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 733 | # Check nested case |
| 734 | dup = [] |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 735 | for k, g in groupby(s, testR): |
| 736 | for ik, ig in groupby(g, testR2): |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 737 | for elem in ig: |
| 738 | self.assertEqual(k, elem[0]) |
| 739 | self.assertEqual(ik, elem[2]) |
| 740 | dup.append(elem) |
| 741 | self.assertEqual(s, dup) |
| 742 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 743 | # Check nested and pickled |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 744 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 745 | dup = [] |
| 746 | for k, g in pickle.loads(pickle.dumps(groupby(s, testR), proto)): |
| 747 | for ik, ig in pickle.loads(pickle.dumps(groupby(g, testR2), proto)): |
| 748 | for elem in ig: |
| 749 | self.assertEqual(k, elem[0]) |
| 750 | self.assertEqual(ik, elem[2]) |
| 751 | dup.append(elem) |
| 752 | self.assertEqual(s, dup) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 753 | |
| 754 | |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 755 | # Check case where inner iterator is not used |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 756 | keys = [k for k, g in groupby(s, testR)] |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 757 | expectedkeys = set([r[0] for r in s]) |
| 758 | self.assertEqual(set(keys), expectedkeys) |
| 759 | self.assertEqual(len(keys), len(expectedkeys)) |
| 760 | |
Serhiy Storchaka | c247caf | 2017-09-24 13:36:11 +0300 | [diff] [blame] | 761 | # Check case where inner iterator is used after advancing the groupby |
| 762 | # iterator |
| 763 | s = list(zip('AABBBAAAA', range(9))) |
| 764 | it = groupby(s, testR) |
| 765 | _, g1 = next(it) |
| 766 | _, g2 = next(it) |
| 767 | _, g3 = next(it) |
| 768 | self.assertEqual(list(g1), []) |
| 769 | self.assertEqual(list(g2), []) |
| 770 | self.assertEqual(next(g3), ('A', 5)) |
| 771 | list(it) # exhaust the groupby iterator |
| 772 | self.assertEqual(list(g3), []) |
| 773 | |
| 774 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 775 | it = groupby(s, testR) |
| 776 | _, g = next(it) |
| 777 | next(it) |
| 778 | next(it) |
| 779 | self.assertEqual(list(pickle.loads(pickle.dumps(g, proto))), []) |
| 780 | |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 781 | # Exercise pipes and filters style |
| 782 | s = 'abracadabra' |
| 783 | # sort s | uniq |
Raymond Hettinger | 64958a1 | 2003-12-17 20:43:33 +0000 | [diff] [blame] | 784 | r = [k for k, g in groupby(sorted(s))] |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 785 | self.assertEqual(r, ['a', 'b', 'c', 'd', 'r']) |
| 786 | # sort s | uniq -d |
Raymond Hettinger | 64958a1 | 2003-12-17 20:43:33 +0000 | [diff] [blame] | 787 | r = [k for k, g in groupby(sorted(s)) if list(islice(g,1,2))] |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 788 | self.assertEqual(r, ['a', 'b', 'r']) |
| 789 | # sort s | uniq -c |
Raymond Hettinger | 64958a1 | 2003-12-17 20:43:33 +0000 | [diff] [blame] | 790 | r = [(len(list(g)), k) for k, g in groupby(sorted(s))] |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 791 | self.assertEqual(r, [(5, 'a'), (2, 'b'), (1, 'c'), (1, 'd'), (2, 'r')]) |
| 792 | # sort s | uniq -c | sort -rn | head -3 |
Raymond Hettinger | 64958a1 | 2003-12-17 20:43:33 +0000 | [diff] [blame] | 793 | r = sorted([(len(list(g)) , k) for k, g in groupby(sorted(s))], reverse=True)[:3] |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 794 | self.assertEqual(r, [(5, 'a'), (2, 'r'), (2, 'b')]) |
| 795 | |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 796 | # iter.__next__ failure |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 797 | class ExpectedError(Exception): |
| 798 | pass |
| 799 | def delayed_raise(n=0): |
| 800 | for i in range(n): |
| 801 | yield 'yo' |
| 802 | raise ExpectedError |
| 803 | def gulp(iterable, keyp=None, func=list): |
| 804 | return [func(g) for k, g in groupby(iterable, keyp)] |
| 805 | |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 806 | # iter.__next__ failure on outer object |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 807 | self.assertRaises(ExpectedError, gulp, delayed_raise(0)) |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 808 | # iter.__next__ failure on inner object |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 809 | self.assertRaises(ExpectedError, gulp, delayed_raise(1)) |
| 810 | |
Serhiy Storchaka | a60c2fe | 2015-03-12 21:56:08 +0200 | [diff] [blame] | 811 | # __eq__ failure |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 812 | class DummyCmp: |
Guido van Rossum | 47b9ff6 | 2006-08-24 00:41:19 +0000 | [diff] [blame] | 813 | def __eq__(self, dst): |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 814 | raise ExpectedError |
| 815 | s = [DummyCmp(), DummyCmp(), None] |
| 816 | |
Guido van Rossum | 47b9ff6 | 2006-08-24 00:41:19 +0000 | [diff] [blame] | 817 | # __eq__ failure on outer object |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 818 | self.assertRaises(ExpectedError, gulp, s, func=id) |
Guido van Rossum | 47b9ff6 | 2006-08-24 00:41:19 +0000 | [diff] [blame] | 819 | # __eq__ failure on inner object |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 820 | self.assertRaises(ExpectedError, gulp, s) |
| 821 | |
| 822 | # keyfunc failure |
| 823 | def keyfunc(obj): |
| 824 | if keyfunc.skip > 0: |
| 825 | keyfunc.skip -= 1 |
| 826 | return obj |
| 827 | else: |
| 828 | raise ExpectedError |
| 829 | |
| 830 | # keyfunc failure on outer object |
| 831 | keyfunc.skip = 0 |
| 832 | self.assertRaises(ExpectedError, gulp, [None], keyfunc) |
| 833 | keyfunc.skip = 1 |
| 834 | self.assertRaises(ExpectedError, gulp, [None, None], keyfunc) |
| 835 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 836 | def test_filter(self): |
| 837 | self.assertEqual(list(filter(isEven, range(6))), [0,2,4]) |
| 838 | self.assertEqual(list(filter(None, [0,1,0,2,0])), [1,2]) |
| 839 | self.assertEqual(list(filter(bool, [0,1,0,2,0])), [1,2]) |
| 840 | self.assertEqual(take(4, filter(isEven, count())), [0,2,4,6]) |
| 841 | self.assertRaises(TypeError, filter) |
| 842 | self.assertRaises(TypeError, filter, lambda x:x) |
| 843 | self.assertRaises(TypeError, filter, lambda x:x, range(6), 7) |
| 844 | self.assertRaises(TypeError, filter, isEven, 3) |
| 845 | self.assertRaises(TypeError, next, filter(range(6), range(6))) |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 846 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 847 | # check copy, deepcopy, pickle |
| 848 | ans = [0,2,4] |
| 849 | |
| 850 | c = filter(isEven, range(6)) |
| 851 | self.assertEqual(list(copy.copy(c)), ans) |
| 852 | c = filter(isEven, range(6)) |
| 853 | self.assertEqual(list(copy.deepcopy(c)), ans) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 854 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 855 | c = filter(isEven, range(6)) |
| 856 | self.assertEqual(list(pickle.loads(pickle.dumps(c, proto))), ans) |
| 857 | next(c) |
| 858 | self.assertEqual(list(pickle.loads(pickle.dumps(c, proto))), ans[1:]) |
| 859 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 860 | c = filter(isEven, range(6)) |
| 861 | self.pickletest(proto, c) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 862 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 863 | def test_filterfalse(self): |
| 864 | self.assertEqual(list(filterfalse(isEven, range(6))), [1,3,5]) |
| 865 | self.assertEqual(list(filterfalse(None, [0,1,0,2,0])), [0,0,0]) |
| 866 | self.assertEqual(list(filterfalse(bool, [0,1,0,2,0])), [0,0,0]) |
| 867 | self.assertEqual(take(4, filterfalse(isEven, count())), [1,3,5,7]) |
| 868 | self.assertRaises(TypeError, filterfalse) |
| 869 | self.assertRaises(TypeError, filterfalse, lambda x:x) |
| 870 | self.assertRaises(TypeError, filterfalse, lambda x:x, range(6), 7) |
| 871 | self.assertRaises(TypeError, filterfalse, isEven, 3) |
| 872 | self.assertRaises(TypeError, next, filterfalse(range(6), range(6))) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 873 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 874 | self.pickletest(proto, filterfalse(isEven, range(6))) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 875 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 876 | def test_zip(self): |
| 877 | # XXX This is rather silly now that builtin zip() calls zip()... |
| 878 | ans = [(x,y) for x, y in zip('abc',count())] |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 879 | self.assertEqual(ans, [('a', 0), ('b', 1), ('c', 2)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 880 | self.assertEqual(list(zip('abc', range(6))), lzip('abc', range(6))) |
| 881 | self.assertEqual(list(zip('abcdef', range(3))), lzip('abcdef', range(3))) |
| 882 | self.assertEqual(take(3,zip('abcdef', count())), lzip('abcdef', range(3))) |
| 883 | self.assertEqual(list(zip('abcdef')), lzip('abcdef')) |
| 884 | self.assertEqual(list(zip()), lzip()) |
| 885 | self.assertRaises(TypeError, zip, 3) |
| 886 | self.assertRaises(TypeError, zip, range(3), 3) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 887 | self.assertEqual([tuple(list(pair)) for pair in zip('abc', 'def')], |
Guido van Rossum | 801f0d7 | 2006-08-24 19:48:10 +0000 | [diff] [blame] | 888 | lzip('abc', 'def')) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 889 | self.assertEqual([pair for pair in zip('abc', 'def')], |
Guido van Rossum | 801f0d7 | 2006-08-24 19:48:10 +0000 | [diff] [blame] | 890 | lzip('abc', 'def')) |
Alex Gaynor | e151d21 | 2011-07-17 16:21:30 -0700 | [diff] [blame] | 891 | |
| 892 | @support.impl_detail("tuple reuse is specific to CPython") |
| 893 | def test_zip_tuple_reuse(self): |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 894 | ids = list(map(id, zip('abc', 'def'))) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 895 | self.assertEqual(min(ids), max(ids)) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 896 | ids = list(map(id, list(zip('abc', 'def')))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 897 | self.assertEqual(len(dict.fromkeys(ids)), len(ids)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 898 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 899 | # check copy, deepcopy, pickle |
| 900 | ans = [(x,y) for x, y in copy.copy(zip('abc',count()))] |
| 901 | self.assertEqual(ans, [('a', 0), ('b', 1), ('c', 2)]) |
| 902 | |
| 903 | ans = [(x,y) for x, y in copy.deepcopy(zip('abc',count()))] |
| 904 | self.assertEqual(ans, [('a', 0), ('b', 1), ('c', 2)]) |
| 905 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 906 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 907 | ans = [(x,y) for x, y in pickle.loads(pickle.dumps(zip('abc',count()), proto))] |
| 908 | self.assertEqual(ans, [('a', 0), ('b', 1), ('c', 2)]) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 909 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 910 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 911 | testIntermediate = zip('abc',count()) |
| 912 | next(testIntermediate) |
| 913 | ans = [(x,y) for x, y in pickle.loads(pickle.dumps(testIntermediate, proto))] |
| 914 | self.assertEqual(ans, [('b', 1), ('c', 2)]) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 915 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 916 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 917 | self.pickletest(proto, zip('abc', count())) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 918 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 919 | def test_ziplongest(self): |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 920 | for args in [ |
| 921 | ['abc', range(6)], |
| 922 | [range(6), 'abc'], |
| 923 | [range(1000), range(2000,2100), range(3000,3050)], |
| 924 | [range(1000), range(0), range(3000,3050), range(1200), range(1500)], |
| 925 | [range(1000), range(0), range(3000,3050), range(1200), range(1500), range(0)], |
| 926 | ]: |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 927 | target = [tuple([arg[i] if i < len(arg) else None for arg in args]) |
| 928 | for i in range(max(map(len, args)))] |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 929 | self.assertEqual(list(zip_longest(*args)), target) |
| 930 | self.assertEqual(list(zip_longest(*args, **{})), target) |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 931 | target = [tuple((e is None and 'X' or e) for e in t) for t in target] # Replace None fills with 'X' |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 932 | self.assertEqual(list(zip_longest(*args, **dict(fillvalue='X'))), target) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 933 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 934 | self.assertEqual(take(3,zip_longest('abcdef', count())), list(zip('abcdef', range(3)))) # take 3 from infinite input |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 935 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 936 | self.assertEqual(list(zip_longest()), list(zip())) |
| 937 | self.assertEqual(list(zip_longest([])), list(zip([]))) |
| 938 | self.assertEqual(list(zip_longest('abcdef')), list(zip('abcdef'))) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 939 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 940 | self.assertEqual(list(zip_longest('abc', 'defg', **{})), |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 941 | list(zip(list('abc')+[None], 'defg'))) # empty keyword dict |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 942 | self.assertRaises(TypeError, zip_longest, 3) |
| 943 | self.assertRaises(TypeError, zip_longest, range(3), 3) |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 944 | |
| 945 | for stmt in [ |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 946 | "zip_longest('abc', fv=1)", |
| 947 | "zip_longest('abc', fillvalue=1, bogus_keyword=None)", |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 948 | ]: |
| 949 | try: |
| 950 | eval(stmt, globals(), locals()) |
| 951 | except TypeError: |
| 952 | pass |
| 953 | else: |
| 954 | self.fail('Did not raise Type in: ' + stmt) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 955 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 956 | self.assertEqual([tuple(list(pair)) for pair in zip_longest('abc', 'def')], |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 957 | list(zip('abc', 'def'))) |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 958 | self.assertEqual([pair for pair in zip_longest('abc', 'def')], |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 959 | list(zip('abc', 'def'))) |
Alex Gaynor | e151d21 | 2011-07-17 16:21:30 -0700 | [diff] [blame] | 960 | |
| 961 | @support.impl_detail("tuple reuse is specific to CPython") |
| 962 | def test_zip_longest_tuple_reuse(self): |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 963 | ids = list(map(id, zip_longest('abc', 'def'))) |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 964 | self.assertEqual(min(ids), max(ids)) |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 965 | ids = list(map(id, list(zip_longest('abc', 'def')))) |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 966 | self.assertEqual(len(dict.fromkeys(ids)), len(ids)) |
| 967 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 968 | def test_zip_longest_pickling(self): |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 969 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 970 | self.pickletest(proto, zip_longest("abc", "def")) |
| 971 | self.pickletest(proto, zip_longest("abc", "defgh")) |
| 972 | self.pickletest(proto, zip_longest("abc", "defgh", fillvalue=1)) |
| 973 | self.pickletest(proto, zip_longest("", "defgh")) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 974 | |
Miss Islington (bot) | 27f4186 | 2019-08-29 23:23:17 -0700 | [diff] [blame] | 975 | def test_zip_longest_bad_iterable(self): |
| 976 | exception = TypeError() |
| 977 | |
| 978 | class BadIterable: |
| 979 | def __iter__(self): |
| 980 | raise exception |
| 981 | |
| 982 | with self.assertRaises(TypeError) as cm: |
| 983 | zip_longest(BadIterable()) |
| 984 | |
| 985 | self.assertIs(cm.exception, exception) |
| 986 | |
Raymond Hettinger | fc43851 | 2009-11-01 20:55:33 +0000 | [diff] [blame] | 987 | def test_bug_7244(self): |
| 988 | |
| 989 | class Repeater: |
| 990 | # this class is similar to itertools.repeat |
| 991 | def __init__(self, o, t, e): |
| 992 | self.o = o |
| 993 | self.t = int(t) |
| 994 | self.e = e |
| 995 | def __iter__(self): # its iterator is itself |
| 996 | return self |
| 997 | def __next__(self): |
| 998 | if self.t > 0: |
| 999 | self.t -= 1 |
| 1000 | return self.o |
| 1001 | else: |
| 1002 | raise self.e |
| 1003 | |
| 1004 | # Formerly this code in would fail in debug mode |
| 1005 | # with Undetected Error and Stop Iteration |
| 1006 | r1 = Repeater(1, 3, StopIteration) |
| 1007 | r2 = Repeater(2, 4, StopIteration) |
| 1008 | def run(r1, r2): |
| 1009 | result = [] |
| 1010 | for i, j in zip_longest(r1, r2, fillvalue=0): |
| 1011 | with support.captured_output('stdout'): |
| 1012 | print((i, j)) |
| 1013 | result.append((i, j)) |
| 1014 | return result |
| 1015 | self.assertEqual(run(r1, r2), [(1,2), (1,2), (1,2), (0,2)]) |
| 1016 | |
| 1017 | # Formerly, the RuntimeError would be lost |
| 1018 | # and StopIteration would stop as expected |
| 1019 | r1 = Repeater(1, 3, RuntimeError) |
| 1020 | r2 = Repeater(2, 4, StopIteration) |
| 1021 | it = zip_longest(r1, r2, fillvalue=0) |
| 1022 | self.assertEqual(next(it), (1, 2)) |
| 1023 | self.assertEqual(next(it), (1, 2)) |
| 1024 | self.assertEqual(next(it), (1, 2)) |
| 1025 | self.assertRaises(RuntimeError, next, it) |
| 1026 | |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1027 | def test_product(self): |
| 1028 | for args, result in [ |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 1029 | ([], [()]), # zero iterables |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1030 | (['ab'], [('a',), ('b',)]), # one iterable |
| 1031 | ([range(2), range(3)], [(0,0), (0,1), (0,2), (1,0), (1,1), (1,2)]), # two iterables |
| 1032 | ([range(0), range(2), range(3)], []), # first iterable with zero length |
| 1033 | ([range(2), range(0), range(3)], []), # middle iterable with zero length |
| 1034 | ([range(2), range(3), range(0)], []), # last iterable with zero length |
| 1035 | ]: |
| 1036 | self.assertEqual(list(product(*args)), result) |
Christian Heimes | f16baeb | 2008-02-29 14:57:44 +0000 | [diff] [blame] | 1037 | for r in range(4): |
| 1038 | self.assertEqual(list(product(*(args*r))), |
| 1039 | list(product(*args, **dict(repeat=r)))) |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1040 | self.assertEqual(len(list(product(*[range(7)]*6))), 7**6) |
| 1041 | self.assertRaises(TypeError, product, range(6), None) |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1042 | |
| 1043 | def product1(*args, **kwds): |
| 1044 | pools = list(map(tuple, args)) * kwds.get('repeat', 1) |
| 1045 | n = len(pools) |
| 1046 | if n == 0: |
| 1047 | yield () |
| 1048 | return |
| 1049 | if any(len(pool) == 0 for pool in pools): |
| 1050 | return |
| 1051 | indices = [0] * n |
| 1052 | yield tuple(pool[i] for pool, i in zip(pools, indices)) |
| 1053 | while 1: |
| 1054 | for i in reversed(range(n)): # right to left |
| 1055 | if indices[i] == len(pools[i]) - 1: |
| 1056 | continue |
| 1057 | indices[i] += 1 |
| 1058 | for j in range(i+1, n): |
| 1059 | indices[j] = 0 |
| 1060 | yield tuple(pool[i] for pool, i in zip(pools, indices)) |
| 1061 | break |
| 1062 | else: |
| 1063 | return |
| 1064 | |
| 1065 | def product2(*args, **kwds): |
| 1066 | 'Pure python version used in docs' |
| 1067 | pools = list(map(tuple, args)) * kwds.get('repeat', 1) |
| 1068 | result = [[]] |
| 1069 | for pool in pools: |
| 1070 | result = [x+[y] for x in result for y in pool] |
| 1071 | for prod in result: |
| 1072 | yield tuple(prod) |
| 1073 | |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1074 | argtypes = ['', 'abc', '', range(0), range(4), dict(a=1, b=2, c=3), |
| 1075 | set('abcdefg'), range(11), tuple(range(13))] |
| 1076 | for i in range(100): |
| 1077 | args = [random.choice(argtypes) for j in range(random.randrange(5))] |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 1078 | expected_len = prod(map(len, args)) |
| 1079 | self.assertEqual(len(list(product(*args))), expected_len) |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1080 | self.assertEqual(list(product(*args)), list(product1(*args))) |
| 1081 | self.assertEqual(list(product(*args)), list(product2(*args))) |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1082 | args = map(iter, args) |
Christian Heimes | 7864476 | 2008-03-04 23:39:23 +0000 | [diff] [blame] | 1083 | self.assertEqual(len(list(product(*args))), expected_len) |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1084 | |
Benjamin Peterson | 0eaabf1 | 2015-02-01 21:34:07 -0500 | [diff] [blame] | 1085 | @support.bigaddrspacetest |
| 1086 | def test_product_overflow(self): |
Serhiy Storchaka | dee948b | 2015-02-03 01:34:09 +0200 | [diff] [blame] | 1087 | with self.assertRaises((OverflowError, MemoryError)): |
| 1088 | product(*(['ab']*2**5), repeat=2**25) |
Benjamin Peterson | 0eaabf1 | 2015-02-01 21:34:07 -0500 | [diff] [blame] | 1089 | |
Alex Gaynor | e151d21 | 2011-07-17 16:21:30 -0700 | [diff] [blame] | 1090 | @support.impl_detail("tuple reuse is specific to CPython") |
| 1091 | def test_product_tuple_reuse(self): |
Christian Heimes | 90c3d9b | 2008-02-23 13:18:03 +0000 | [diff] [blame] | 1092 | self.assertEqual(len(set(map(id, product('abc', 'def')))), 1) |
| 1093 | self.assertNotEqual(len(set(map(id, list(product('abc', 'def'))))), 1) |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1094 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1095 | def test_product_pickling(self): |
| 1096 | # check copy, deepcopy, pickle |
| 1097 | for args, result in [ |
| 1098 | ([], [()]), # zero iterables |
| 1099 | (['ab'], [('a',), ('b',)]), # one iterable |
| 1100 | ([range(2), range(3)], [(0,0), (0,1), (0,2), (1,0), (1,1), (1,2)]), # two iterables |
| 1101 | ([range(0), range(2), range(3)], []), # first iterable with zero length |
| 1102 | ([range(2), range(0), range(3)], []), # middle iterable with zero length |
| 1103 | ([range(2), range(3), range(0)], []), # last iterable with zero length |
| 1104 | ]: |
| 1105 | self.assertEqual(list(copy.copy(product(*args))), result) |
| 1106 | self.assertEqual(list(copy.deepcopy(product(*args))), result) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1107 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1108 | self.pickletest(proto, product(*args)) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1109 | |
Kristján Valur Jónsson | 102764a | 2015-09-12 15:20:54 +0000 | [diff] [blame] | 1110 | def test_product_issue_25021(self): |
| 1111 | # test that indices are properly clamped to the length of the tuples |
| 1112 | p = product((1, 2),(3,)) |
| 1113 | p.__setstate__((0, 0x1000)) # will access tuple element 1 if not clamped |
| 1114 | self.assertEqual(next(p), (2, 3)) |
| 1115 | # test that empty tuple in the list will result in an immediate StopIteration |
| 1116 | p = product((1, 2), (), (3,)) |
| 1117 | p.__setstate__((0, 0, 0x1000)) # will access tuple element 1 if not clamped |
| 1118 | self.assertRaises(StopIteration, next, p) |
| 1119 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1120 | def test_repeat(self): |
Raymond Hettinger | f4bb7f2 | 2009-02-19 02:44:01 +0000 | [diff] [blame] | 1121 | self.assertEqual(list(repeat(object='a', times=3)), ['a', 'a', 'a']) |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1122 | self.assertEqual(lzip(range(3),repeat('a')), |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1123 | [(0, 'a'), (1, 'a'), (2, 'a')]) |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1124 | self.assertEqual(list(repeat('a', 3)), ['a', 'a', 'a']) |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 1125 | self.assertEqual(take(3, repeat('a')), ['a', 'a', 'a']) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1126 | self.assertEqual(list(repeat('a', 0)), []) |
| 1127 | self.assertEqual(list(repeat('a', -3)), []) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1128 | self.assertRaises(TypeError, repeat) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1129 | self.assertRaises(TypeError, repeat, None, 3, 4) |
| 1130 | self.assertRaises(TypeError, repeat, None, 'a') |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 1131 | r = repeat(1+0j) |
| 1132 | self.assertEqual(repr(r), 'repeat((1+0j))') |
| 1133 | r = repeat(1+0j, 5) |
| 1134 | self.assertEqual(repr(r), 'repeat((1+0j), 5)') |
| 1135 | list(r) |
| 1136 | self.assertEqual(repr(r), 'repeat((1+0j), 0)') |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1137 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1138 | # check copy, deepcopy, pickle |
| 1139 | c = repeat(object='a', times=10) |
| 1140 | self.assertEqual(next(c), 'a') |
| 1141 | self.assertEqual(take(2, copy.copy(c)), list('a' * 2)) |
| 1142 | self.assertEqual(take(2, copy.deepcopy(c)), list('a' * 2)) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1143 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1144 | self.pickletest(proto, repeat(object='a', times=10)) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1145 | |
Raymond Hettinger | 97d3555 | 2014-06-24 21:36:58 -0700 | [diff] [blame] | 1146 | def test_repeat_with_negative_times(self): |
| 1147 | self.assertEqual(repr(repeat('a', -1)), "repeat('a', 0)") |
| 1148 | self.assertEqual(repr(repeat('a', -2)), "repeat('a', 0)") |
| 1149 | self.assertEqual(repr(repeat('a', times=-1)), "repeat('a', 0)") |
| 1150 | self.assertEqual(repr(repeat('a', times=-2)), "repeat('a', 0)") |
| 1151 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1152 | def test_map(self): |
| 1153 | self.assertEqual(list(map(operator.pow, range(3), range(1,7))), |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1154 | [0**1, 1**2, 2**3]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1155 | self.assertEqual(list(map(tupleize, 'abc', range(5))), |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1156 | [('a',0),('b',1),('c',2)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1157 | self.assertEqual(list(map(tupleize, 'abc', count())), |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 1158 | [('a',0),('b',1),('c',2)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1159 | self.assertEqual(take(2,map(tupleize, 'abc', count())), |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 1160 | [('a',0),('b',1)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1161 | self.assertEqual(list(map(operator.pow, [])), []) |
| 1162 | self.assertRaises(TypeError, map) |
| 1163 | self.assertRaises(TypeError, list, map(None, range(3), range(3))) |
| 1164 | self.assertRaises(TypeError, map, operator.neg) |
| 1165 | self.assertRaises(TypeError, next, map(10, range(5))) |
| 1166 | self.assertRaises(ValueError, next, map(errfunc, [4], [5])) |
| 1167 | self.assertRaises(TypeError, next, map(onearg, [4], [5])) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1168 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1169 | # check copy, deepcopy, pickle |
| 1170 | ans = [('a',0),('b',1),('c',2)] |
| 1171 | |
| 1172 | c = map(tupleize, 'abc', count()) |
| 1173 | self.assertEqual(list(copy.copy(c)), ans) |
| 1174 | |
| 1175 | c = map(tupleize, 'abc', count()) |
| 1176 | self.assertEqual(list(copy.deepcopy(c)), ans) |
| 1177 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1178 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1179 | c = map(tupleize, 'abc', count()) |
| 1180 | self.pickletest(proto, c) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1181 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1182 | def test_starmap(self): |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1183 | self.assertEqual(list(starmap(operator.pow, zip(range(3), range(1,7)))), |
| 1184 | [0**1, 1**2, 2**3]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1185 | self.assertEqual(take(3, starmap(operator.pow, zip(count(), count(1)))), |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 1186 | [0**1, 1**2, 2**3]) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1187 | self.assertEqual(list(starmap(operator.pow, [])), []) |
Christian Heimes | 679db4a | 2008-01-18 09:56:22 +0000 | [diff] [blame] | 1188 | self.assertEqual(list(starmap(operator.pow, [iter([4,5])])), [4**5]) |
| 1189 | self.assertRaises(TypeError, list, starmap(operator.pow, [None])) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1190 | self.assertRaises(TypeError, starmap) |
| 1191 | self.assertRaises(TypeError, starmap, operator.pow, [(4,5)], 'extra') |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1192 | self.assertRaises(TypeError, next, starmap(10, [(4,5)])) |
| 1193 | self.assertRaises(ValueError, next, starmap(errfunc, [(4,5)])) |
| 1194 | self.assertRaises(TypeError, next, starmap(onearg, [(4,5)])) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1195 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1196 | # check copy, deepcopy, pickle |
| 1197 | ans = [0**1, 1**2, 2**3] |
| 1198 | |
| 1199 | c = starmap(operator.pow, zip(range(3), range(1,7))) |
| 1200 | self.assertEqual(list(copy.copy(c)), ans) |
| 1201 | |
| 1202 | c = starmap(operator.pow, zip(range(3), range(1,7))) |
| 1203 | self.assertEqual(list(copy.deepcopy(c)), ans) |
| 1204 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1205 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1206 | c = starmap(operator.pow, zip(range(3), range(1,7))) |
| 1207 | self.pickletest(proto, c) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1208 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1209 | def test_islice(self): |
| 1210 | for args in [ # islice(args) should agree with range(args) |
| 1211 | (10, 20, 3), |
| 1212 | (10, 3, 20), |
| 1213 | (10, 20), |
Cheryl Sabella | da1734c | 2018-03-26 21:29:33 -0400 | [diff] [blame] | 1214 | (10, 10), |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1215 | (10, 3), |
| 1216 | (20,) |
| 1217 | ]: |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1218 | self.assertEqual(list(islice(range(100), *args)), |
| 1219 | list(range(*args))) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1220 | |
| 1221 | for args, tgtargs in [ # Stop when seqn is exhausted |
| 1222 | ((10, 110, 3), ((10, 100, 3))), |
| 1223 | ((10, 110), ((10, 100))), |
| 1224 | ((110,), (100,)) |
| 1225 | ]: |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1226 | self.assertEqual(list(islice(range(100), *args)), |
| 1227 | list(range(*tgtargs))) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1228 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 1229 | # Test stop=None |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1230 | self.assertEqual(list(islice(range(10), None)), list(range(10))) |
| 1231 | self.assertEqual(list(islice(range(10), None, None)), list(range(10))) |
| 1232 | self.assertEqual(list(islice(range(10), None, None, None)), list(range(10))) |
| 1233 | self.assertEqual(list(islice(range(10), 2, None)), list(range(2, 10))) |
| 1234 | self.assertEqual(list(islice(range(10), 1, None, 2)), list(range(1, 10, 2))) |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 1235 | |
Raymond Hettinger | fdf3bd6 | 2005-03-27 20:11:44 +0000 | [diff] [blame] | 1236 | # Test number of items consumed SF #1171417 |
| 1237 | it = iter(range(10)) |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1238 | self.assertEqual(list(islice(it, 3)), list(range(3))) |
| 1239 | self.assertEqual(list(it), list(range(3, 10))) |
Raymond Hettinger | fdf3bd6 | 2005-03-27 20:11:44 +0000 | [diff] [blame] | 1240 | |
Cheryl Sabella | da1734c | 2018-03-26 21:29:33 -0400 | [diff] [blame] | 1241 | it = iter(range(10)) |
| 1242 | self.assertEqual(list(islice(it, 3, 3)), []) |
| 1243 | self.assertEqual(list(it), list(range(3, 10))) |
| 1244 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 1245 | # Test invalid arguments |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1246 | ra = range(10) |
| 1247 | self.assertRaises(TypeError, islice, ra) |
| 1248 | self.assertRaises(TypeError, islice, ra, 1, 2, 3, 4) |
| 1249 | self.assertRaises(ValueError, islice, ra, -5, 10, 1) |
| 1250 | self.assertRaises(ValueError, islice, ra, 1, -5, -1) |
| 1251 | self.assertRaises(ValueError, islice, ra, 1, 10, -1) |
| 1252 | self.assertRaises(ValueError, islice, ra, 1, 10, 0) |
| 1253 | self.assertRaises(ValueError, islice, ra, 'a') |
| 1254 | self.assertRaises(ValueError, islice, ra, 'a', 1) |
| 1255 | self.assertRaises(ValueError, islice, ra, 1, 'a') |
| 1256 | self.assertRaises(ValueError, islice, ra, 'a', 1, 1) |
| 1257 | self.assertRaises(ValueError, islice, ra, 1, 'a', 1) |
Guido van Rossum | 360e4b8 | 2007-05-14 22:51:27 +0000 | [diff] [blame] | 1258 | self.assertEqual(len(list(islice(count(), 1, 10, maxsize))), 1) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1259 | |
Raymond Hettinger | 69b34bf | 2010-11-30 02:49:29 +0000 | [diff] [blame] | 1260 | # Issue #10323: Less islice in a predictable state |
| 1261 | c = count() |
| 1262 | self.assertEqual(list(islice(c, 1, 3, 50)), [1]) |
| 1263 | self.assertEqual(next(c), 3) |
| 1264 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1265 | # check copy, deepcopy, pickle |
| 1266 | for args in [ # islice(args) should agree with range(args) |
| 1267 | (10, 20, 3), |
| 1268 | (10, 3, 20), |
| 1269 | (10, 20), |
| 1270 | (10, 3), |
| 1271 | (20,) |
| 1272 | ]: |
| 1273 | self.assertEqual(list(copy.copy(islice(range(100), *args))), |
| 1274 | list(range(*args))) |
| 1275 | self.assertEqual(list(copy.deepcopy(islice(range(100), *args))), |
| 1276 | list(range(*args))) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1277 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1278 | self.pickletest(proto, islice(range(100), *args)) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1279 | |
Antoine Pitrou | 26f82ef | 2014-04-29 12:13:46 +0200 | [diff] [blame] | 1280 | # Issue #21321: check source iterator is not referenced |
| 1281 | # from islice() after the latter has been exhausted |
| 1282 | it = (x for x in (1, 2)) |
| 1283 | wr = weakref.ref(it) |
| 1284 | it = islice(it, 1) |
| 1285 | self.assertIsNotNone(wr()) |
| 1286 | list(it) # exhaust the iterator |
Benjamin Peterson | 8e16351 | 2014-08-24 18:07:28 -0500 | [diff] [blame] | 1287 | support.gc_collect() |
Antoine Pitrou | 26f82ef | 2014-04-29 12:13:46 +0200 | [diff] [blame] | 1288 | self.assertIsNone(wr()) |
| 1289 | |
Will Roberts | 0ecdc52 | 2017-06-08 08:03:04 +0200 | [diff] [blame] | 1290 | # Issue #30537: islice can accept integer-like objects as |
| 1291 | # arguments |
| 1292 | class IntLike(object): |
| 1293 | def __init__(self, val): |
| 1294 | self.val = val |
| 1295 | def __index__(self): |
| 1296 | return self.val |
| 1297 | self.assertEqual(list(islice(range(100), IntLike(10))), list(range(10))) |
| 1298 | self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50))), |
| 1299 | list(range(10, 50))) |
| 1300 | self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50), IntLike(5))), |
| 1301 | list(range(10,50,5))) |
| 1302 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1303 | def test_takewhile(self): |
| 1304 | data = [1, 3, 5, 20, 2, 4, 6, 8] |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1305 | self.assertEqual(list(takewhile(underten, data)), [1, 3, 5]) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1306 | self.assertEqual(list(takewhile(underten, [])), []) |
| 1307 | self.assertRaises(TypeError, takewhile) |
| 1308 | self.assertRaises(TypeError, takewhile, operator.pow) |
| 1309 | self.assertRaises(TypeError, takewhile, operator.pow, [(4,5)], 'extra') |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1310 | self.assertRaises(TypeError, next, takewhile(10, [(4,5)])) |
| 1311 | self.assertRaises(ValueError, next, takewhile(errfunc, [(4,5)])) |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 1312 | t = takewhile(bool, [1, 1, 1, 0, 0, 0]) |
| 1313 | self.assertEqual(list(t), [1, 1, 1]) |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1314 | self.assertRaises(StopIteration, next, t) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1315 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1316 | # check copy, deepcopy, pickle |
| 1317 | self.assertEqual(list(copy.copy(takewhile(underten, data))), [1, 3, 5]) |
| 1318 | self.assertEqual(list(copy.deepcopy(takewhile(underten, data))), |
| 1319 | [1, 3, 5]) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1320 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1321 | self.pickletest(proto, takewhile(underten, data)) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1322 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1323 | def test_dropwhile(self): |
| 1324 | data = [1, 3, 5, 20, 2, 4, 6, 8] |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1325 | self.assertEqual(list(dropwhile(underten, data)), [20, 2, 4, 6, 8]) |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1326 | self.assertEqual(list(dropwhile(underten, [])), []) |
| 1327 | self.assertRaises(TypeError, dropwhile) |
| 1328 | self.assertRaises(TypeError, dropwhile, operator.pow) |
| 1329 | self.assertRaises(TypeError, dropwhile, operator.pow, [(4,5)], 'extra') |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1330 | self.assertRaises(TypeError, next, dropwhile(10, [(4,5)])) |
| 1331 | self.assertRaises(ValueError, next, dropwhile(errfunc, [(4,5)])) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1332 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1333 | # check copy, deepcopy, pickle |
| 1334 | self.assertEqual(list(copy.copy(dropwhile(underten, data))), [20, 2, 4, 6, 8]) |
| 1335 | self.assertEqual(list(copy.deepcopy(dropwhile(underten, data))), |
| 1336 | [20, 2, 4, 6, 8]) |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1337 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1338 | self.pickletest(proto, dropwhile(underten, data)) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1339 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1340 | def test_tee(self): |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1341 | n = 200 |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1342 | |
| 1343 | a, b = tee([]) # test empty iterator |
| 1344 | self.assertEqual(list(a), []) |
| 1345 | self.assertEqual(list(b), []) |
| 1346 | |
| 1347 | a, b = tee(irange(n)) # test 100% interleaved |
Guido van Rossum | 801f0d7 | 2006-08-24 19:48:10 +0000 | [diff] [blame] | 1348 | self.assertEqual(lzip(a,b), lzip(range(n), range(n))) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1349 | |
| 1350 | a, b = tee(irange(n)) # test 0% interleaved |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1351 | self.assertEqual(list(a), list(range(n))) |
| 1352 | self.assertEqual(list(b), list(range(n))) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1353 | |
| 1354 | a, b = tee(irange(n)) # test dealloc of leading iterator |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1355 | for i in range(100): |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1356 | self.assertEqual(next(a), i) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1357 | del a |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1358 | self.assertEqual(list(b), list(range(n))) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1359 | |
| 1360 | a, b = tee(irange(n)) # test dealloc of trailing iterator |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1361 | for i in range(100): |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1362 | self.assertEqual(next(a), i) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1363 | del b |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1364 | self.assertEqual(list(a), list(range(100, n))) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1365 | |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1366 | for j in range(5): # test randomly interleaved |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1367 | order = [0]*n + [1]*n |
| 1368 | random.shuffle(order) |
| 1369 | lists = ([], []) |
| 1370 | its = tee(irange(n)) |
| 1371 | for i in order: |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1372 | value = next(its[i]) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1373 | lists[i].append(value) |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1374 | self.assertEqual(lists[0], list(range(n))) |
| 1375 | self.assertEqual(lists[1], list(range(n))) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1376 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1377 | # test argument format checking |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1378 | self.assertRaises(TypeError, tee) |
| 1379 | self.assertRaises(TypeError, tee, 3) |
| 1380 | self.assertRaises(TypeError, tee, [1,2], 'x') |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1381 | self.assertRaises(TypeError, tee, [1,2], 3, 'x') |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1382 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1383 | # tee object should be instantiable |
| 1384 | a, b = tee('abc') |
| 1385 | c = type(a)('def') |
| 1386 | self.assertEqual(list(c), list('def')) |
Raymond Hettinger | f0c5aec | 2003-10-26 14:25:56 +0000 | [diff] [blame] | 1387 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1388 | # test long-lagged and multi-way split |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1389 | a, b, c = tee(range(2000), 3) |
| 1390 | for i in range(100): |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1391 | self.assertEqual(next(a), i) |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1392 | self.assertEqual(list(b), list(range(2000))) |
| 1393 | self.assertEqual([next(c), next(c)], list(range(2))) |
| 1394 | self.assertEqual(list(a), list(range(100,2000))) |
| 1395 | self.assertEqual(list(c), list(range(2,2000))) |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1396 | |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 1397 | # test values of n |
| 1398 | self.assertRaises(TypeError, tee, 'abc', 'invalid') |
Thomas Wouters | 89f507f | 2006-12-13 04:49:30 +0000 | [diff] [blame] | 1399 | self.assertRaises(ValueError, tee, [], -1) |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1400 | for n in range(5): |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 1401 | result = tee('abc', n) |
| 1402 | self.assertEqual(type(result), tuple) |
| 1403 | self.assertEqual(len(result), n) |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 1404 | self.assertEqual([list(x) for x in result], [list('abc')]*n) |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 1405 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1406 | # tee pass-through to copyable iterator |
| 1407 | a, b = tee('abc') |
| 1408 | c, d = tee(a) |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 1409 | self.assertTrue(a is c) |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 1410 | |
Raymond Hettinger | 4cda01e | 2004-09-28 04:45:28 +0000 | [diff] [blame] | 1411 | # test tee_new |
| 1412 | t1, t2 = tee('abc') |
| 1413 | tnew = type(t1) |
| 1414 | self.assertRaises(TypeError, tnew) |
| 1415 | self.assertRaises(TypeError, tnew, 10) |
| 1416 | t3 = tnew(t1) |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 1417 | self.assertTrue(list(t1) == list(t2) == list(t3) == list('abc')) |
Raymond Hettinger | f0c5aec | 2003-10-26 14:25:56 +0000 | [diff] [blame] | 1418 | |
Raymond Hettinger | a9f6092 | 2004-10-17 16:40:14 +0000 | [diff] [blame] | 1419 | # test that tee objects are weak referencable |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1420 | a, b = tee(range(10)) |
Antoine Pitrou | 26f82ef | 2014-04-29 12:13:46 +0200 | [diff] [blame] | 1421 | p = weakref.proxy(a) |
Raymond Hettinger | a9f6092 | 2004-10-17 16:40:14 +0000 | [diff] [blame] | 1422 | self.assertEqual(getattr(p, '__class__'), type(b)) |
| 1423 | del a |
| 1424 | self.assertRaises(ReferenceError, getattr, p, '__class__') |
| 1425 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1426 | ans = list('abc') |
| 1427 | long_ans = list(range(10000)) |
| 1428 | |
| 1429 | # check copy |
| 1430 | a, b = tee('abc') |
| 1431 | self.assertEqual(list(copy.copy(a)), ans) |
| 1432 | self.assertEqual(list(copy.copy(b)), ans) |
| 1433 | a, b = tee(list(range(10000))) |
| 1434 | self.assertEqual(list(copy.copy(a)), long_ans) |
| 1435 | self.assertEqual(list(copy.copy(b)), long_ans) |
| 1436 | |
| 1437 | # check partially consumed copy |
| 1438 | a, b = tee('abc') |
| 1439 | take(2, a) |
| 1440 | take(1, b) |
| 1441 | self.assertEqual(list(copy.copy(a)), ans[2:]) |
| 1442 | self.assertEqual(list(copy.copy(b)), ans[1:]) |
| 1443 | self.assertEqual(list(a), ans[2:]) |
| 1444 | self.assertEqual(list(b), ans[1:]) |
| 1445 | a, b = tee(range(10000)) |
| 1446 | take(100, a) |
| 1447 | take(60, b) |
| 1448 | self.assertEqual(list(copy.copy(a)), long_ans[100:]) |
| 1449 | self.assertEqual(list(copy.copy(b)), long_ans[60:]) |
| 1450 | self.assertEqual(list(a), long_ans[100:]) |
| 1451 | self.assertEqual(list(b), long_ans[60:]) |
| 1452 | |
| 1453 | # check deepcopy |
| 1454 | a, b = tee('abc') |
| 1455 | self.assertEqual(list(copy.deepcopy(a)), ans) |
| 1456 | self.assertEqual(list(copy.deepcopy(b)), ans) |
| 1457 | self.assertEqual(list(a), ans) |
| 1458 | self.assertEqual(list(b), ans) |
| 1459 | a, b = tee(range(10000)) |
| 1460 | self.assertEqual(list(copy.deepcopy(a)), long_ans) |
| 1461 | self.assertEqual(list(copy.deepcopy(b)), long_ans) |
| 1462 | self.assertEqual(list(a), long_ans) |
| 1463 | self.assertEqual(list(b), long_ans) |
| 1464 | |
| 1465 | # check partially consumed deepcopy |
| 1466 | a, b = tee('abc') |
| 1467 | take(2, a) |
| 1468 | take(1, b) |
| 1469 | self.assertEqual(list(copy.deepcopy(a)), ans[2:]) |
| 1470 | self.assertEqual(list(copy.deepcopy(b)), ans[1:]) |
| 1471 | self.assertEqual(list(a), ans[2:]) |
| 1472 | self.assertEqual(list(b), ans[1:]) |
| 1473 | a, b = tee(range(10000)) |
| 1474 | take(100, a) |
| 1475 | take(60, b) |
| 1476 | self.assertEqual(list(copy.deepcopy(a)), long_ans[100:]) |
| 1477 | self.assertEqual(list(copy.deepcopy(b)), long_ans[60:]) |
| 1478 | self.assertEqual(list(a), long_ans[100:]) |
| 1479 | self.assertEqual(list(b), long_ans[60:]) |
| 1480 | |
| 1481 | # check pickle |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1482 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1483 | self.pickletest(proto, iter(tee('abc'))) |
| 1484 | a, b = tee('abc') |
| 1485 | self.pickletest(proto, a, compare=ans) |
| 1486 | self.pickletest(proto, b, compare=ans) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1487 | |
Serhiy Storchaka | a3e9128 | 2013-01-25 13:19:31 +0200 | [diff] [blame] | 1488 | # Issue 13454: Crash when deleting backward iterator from tee() |
| 1489 | def test_tee_del_backward(self): |
Serhiy Storchaka | 5bb893c | 2013-01-26 11:52:06 +0200 | [diff] [blame] | 1490 | forward, backward = tee(repeat(None, 20000000)) |
Serhiy Storchaka | 9db5500 | 2015-03-28 20:38:37 +0200 | [diff] [blame] | 1491 | try: |
| 1492 | any(forward) # exhaust the iterator |
| 1493 | del backward |
| 1494 | except: |
| 1495 | del forward, backward |
| 1496 | raise |
Serhiy Storchaka | a3e9128 | 2013-01-25 13:19:31 +0200 | [diff] [blame] | 1497 | |
Miss Islington (bot) | 6e3809c | 2019-09-09 02:07:51 -0700 | [diff] [blame] | 1498 | def test_tee_reenter(self): |
| 1499 | class I: |
| 1500 | first = True |
| 1501 | def __iter__(self): |
| 1502 | return self |
| 1503 | def __next__(self): |
| 1504 | first = self.first |
| 1505 | self.first = False |
| 1506 | if first: |
| 1507 | return next(b) |
| 1508 | |
| 1509 | a, b = tee(I()) |
| 1510 | with self.assertRaisesRegex(RuntimeError, "tee"): |
| 1511 | next(a) |
| 1512 | |
| 1513 | def test_tee_concurrent(self): |
| 1514 | start = threading.Event() |
| 1515 | finish = threading.Event() |
| 1516 | class I: |
| 1517 | def __iter__(self): |
| 1518 | return self |
| 1519 | def __next__(self): |
| 1520 | start.set() |
| 1521 | finish.wait() |
| 1522 | |
| 1523 | a, b = tee(I()) |
| 1524 | thread = threading.Thread(target=next, args=[a]) |
| 1525 | thread.start() |
| 1526 | try: |
| 1527 | start.wait() |
| 1528 | with self.assertRaisesRegex(RuntimeError, "tee"): |
| 1529 | next(b) |
| 1530 | finally: |
| 1531 | finish.set() |
| 1532 | thread.join() |
| 1533 | |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 1534 | def test_StopIteration(self): |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1535 | self.assertRaises(StopIteration, next, zip()) |
Raymond Hettinger | b5a4208 | 2003-08-08 05:10:41 +0000 | [diff] [blame] | 1536 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1537 | for f in (chain, cycle, zip, groupby): |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1538 | self.assertRaises(StopIteration, next, f([])) |
| 1539 | self.assertRaises(StopIteration, next, f(StopNow())) |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 1540 | |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1541 | self.assertRaises(StopIteration, next, islice([], None)) |
| 1542 | self.assertRaises(StopIteration, next, islice(StopNow(), None)) |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 1543 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1544 | p, q = tee([]) |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1545 | self.assertRaises(StopIteration, next, p) |
| 1546 | self.assertRaises(StopIteration, next, q) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1547 | p, q = tee(StopNow()) |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1548 | self.assertRaises(StopIteration, next, p) |
| 1549 | self.assertRaises(StopIteration, next, q) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1550 | |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1551 | self.assertRaises(StopIteration, next, repeat(None, 0)) |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 1552 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1553 | for f in (filter, filterfalse, map, takewhile, dropwhile, starmap): |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1554 | self.assertRaises(StopIteration, next, f(lambda x:x, [])) |
| 1555 | self.assertRaises(StopIteration, next, f(lambda x:x, StopNow())) |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 1556 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1557 | class TestExamples(unittest.TestCase): |
| 1558 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1559 | def test_accumulate(self): |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 1560 | self.assertEqual(list(accumulate([1,2,3,4,5])), [1, 3, 6, 10, 15]) |
| 1561 | |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1562 | def test_accumulate_reducible(self): |
| 1563 | # check copy, deepcopy, pickle |
| 1564 | data = [1, 2, 3, 4, 5] |
| 1565 | accumulated = [1, 3, 6, 10, 15] |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1566 | |
Serhiy Storchaka | bad1257 | 2014-12-15 14:03:42 +0200 | [diff] [blame] | 1567 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1568 | it = accumulate(data) |
| 1569 | self.assertEqual(list(pickle.loads(pickle.dumps(it, proto))), accumulated[:]) |
| 1570 | self.assertEqual(next(it), 1) |
| 1571 | self.assertEqual(list(pickle.loads(pickle.dumps(it, proto))), accumulated[1:]) |
| 1572 | it = accumulate(data) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1573 | self.assertEqual(next(it), 1) |
Kristján Valur Jónsson | 31668b8 | 2012-04-03 10:49:41 +0000 | [diff] [blame] | 1574 | self.assertEqual(list(copy.deepcopy(it)), accumulated[1:]) |
| 1575 | self.assertEqual(list(copy.copy(it)), accumulated[1:]) |
| 1576 | |
Serhiy Storchaka | d551625 | 2016-03-06 14:00:45 +0200 | [diff] [blame] | 1577 | def test_accumulate_reducible_none(self): |
| 1578 | # Issue #25718: total is None |
| 1579 | it = accumulate([None, None, None], operator.is_) |
| 1580 | self.assertEqual(next(it), None) |
| 1581 | for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| 1582 | it_copy = pickle.loads(pickle.dumps(it, proto)) |
| 1583 | self.assertEqual(list(it_copy), [True, False]) |
| 1584 | self.assertEqual(list(copy.deepcopy(it)), [True, False]) |
| 1585 | self.assertEqual(list(copy.copy(it)), [True, False]) |
| 1586 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1587 | def test_chain(self): |
| 1588 | self.assertEqual(''.join(chain('ABC', 'DEF')), 'ABCDEF') |
| 1589 | |
| 1590 | def test_chain_from_iterable(self): |
| 1591 | self.assertEqual(''.join(chain.from_iterable(['ABC', 'DEF'])), 'ABCDEF') |
| 1592 | |
| 1593 | def test_combinations(self): |
| 1594 | self.assertEqual(list(combinations('ABCD', 2)), |
| 1595 | [('A','B'), ('A','C'), ('A','D'), ('B','C'), ('B','D'), ('C','D')]) |
| 1596 | self.assertEqual(list(combinations(range(4), 3)), |
| 1597 | [(0,1,2), (0,1,3), (0,2,3), (1,2,3)]) |
| 1598 | |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 1599 | def test_combinations_with_replacement(self): |
| 1600 | self.assertEqual(list(combinations_with_replacement('ABC', 2)), |
| 1601 | [('A','A'), ('A','B'), ('A','C'), ('B','B'), ('B','C'), ('C','C')]) |
| 1602 | |
Raymond Hettinger | 6b3b0fc | 2009-01-26 02:56:58 +0000 | [diff] [blame] | 1603 | def test_compress(self): |
| 1604 | self.assertEqual(list(compress('ABCDEF', [1,0,1,0,1,1])), list('ACEF')) |
| 1605 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1606 | def test_count(self): |
| 1607 | self.assertEqual(list(islice(count(10), 5)), [10, 11, 12, 13, 14]) |
| 1608 | |
| 1609 | def test_cycle(self): |
| 1610 | self.assertEqual(list(islice(cycle('ABCD'), 12)), list('ABCDABCDABCD')) |
| 1611 | |
| 1612 | def test_dropwhile(self): |
| 1613 | self.assertEqual(list(dropwhile(lambda x: x<5, [1,4,6,4,1])), [6,4,1]) |
| 1614 | |
| 1615 | def test_groupby(self): |
| 1616 | self.assertEqual([k for k, g in groupby('AAAABBBCCDAABBB')], |
| 1617 | list('ABCDAB')) |
| 1618 | self.assertEqual([(list(g)) for k, g in groupby('AAAABBBCCD')], |
| 1619 | [list('AAAA'), list('BBB'), list('CC'), list('D')]) |
| 1620 | |
| 1621 | def test_filter(self): |
| 1622 | self.assertEqual(list(filter(lambda x: x%2, range(10))), [1,3,5,7,9]) |
| 1623 | |
| 1624 | def test_filterfalse(self): |
| 1625 | self.assertEqual(list(filterfalse(lambda x: x%2, range(10))), [0,2,4,6,8]) |
| 1626 | |
| 1627 | def test_map(self): |
| 1628 | self.assertEqual(list(map(pow, (2,3,10), (5,2,3))), [32, 9, 1000]) |
| 1629 | |
| 1630 | def test_islice(self): |
| 1631 | self.assertEqual(list(islice('ABCDEFG', 2)), list('AB')) |
| 1632 | self.assertEqual(list(islice('ABCDEFG', 2, 4)), list('CD')) |
| 1633 | self.assertEqual(list(islice('ABCDEFG', 2, None)), list('CDEFG')) |
| 1634 | self.assertEqual(list(islice('ABCDEFG', 0, None, 2)), list('ACEG')) |
| 1635 | |
| 1636 | def test_zip(self): |
| 1637 | self.assertEqual(list(zip('ABCD', 'xy')), [('A', 'x'), ('B', 'y')]) |
| 1638 | |
| 1639 | def test_zip_longest(self): |
| 1640 | self.assertEqual(list(zip_longest('ABCD', 'xy', fillvalue='-')), |
| 1641 | [('A', 'x'), ('B', 'y'), ('C', '-'), ('D', '-')]) |
| 1642 | |
| 1643 | def test_permutations(self): |
| 1644 | self.assertEqual(list(permutations('ABCD', 2)), |
| 1645 | list(map(tuple, 'AB AC AD BA BC BD CA CB CD DA DB DC'.split()))) |
| 1646 | self.assertEqual(list(permutations(range(3))), |
| 1647 | [(0,1,2), (0,2,1), (1,0,2), (1,2,0), (2,0,1), (2,1,0)]) |
| 1648 | |
| 1649 | def test_product(self): |
| 1650 | self.assertEqual(list(product('ABCD', 'xy')), |
| 1651 | list(map(tuple, 'Ax Ay Bx By Cx Cy Dx Dy'.split()))) |
| 1652 | self.assertEqual(list(product(range(2), repeat=3)), |
| 1653 | [(0,0,0), (0,0,1), (0,1,0), (0,1,1), |
| 1654 | (1,0,0), (1,0,1), (1,1,0), (1,1,1)]) |
| 1655 | |
| 1656 | def test_repeat(self): |
| 1657 | self.assertEqual(list(repeat(10, 3)), [10, 10, 10]) |
| 1658 | |
| 1659 | def test_stapmap(self): |
| 1660 | self.assertEqual(list(starmap(pow, [(2,5), (3,2), (10,3)])), |
| 1661 | [32, 9, 1000]) |
| 1662 | |
| 1663 | def test_takewhile(self): |
| 1664 | self.assertEqual(list(takewhile(lambda x: x<5, [1,4,6,4,1])), [1,4]) |
| 1665 | |
| 1666 | |
Cheryl Sabella | da1734c | 2018-03-26 21:29:33 -0400 | [diff] [blame] | 1667 | class TestPurePythonRoughEquivalents(unittest.TestCase): |
| 1668 | |
| 1669 | @staticmethod |
| 1670 | def islice(iterable, *args): |
| 1671 | s = slice(*args) |
| 1672 | start, stop, step = s.start or 0, s.stop or sys.maxsize, s.step or 1 |
| 1673 | it = iter(range(start, stop, step)) |
| 1674 | try: |
| 1675 | nexti = next(it) |
| 1676 | except StopIteration: |
| 1677 | # Consume *iterable* up to the *start* position. |
| 1678 | for i, element in zip(range(start), iterable): |
| 1679 | pass |
| 1680 | return |
| 1681 | try: |
| 1682 | for i, element in enumerate(iterable): |
| 1683 | if i == nexti: |
| 1684 | yield element |
| 1685 | nexti = next(it) |
| 1686 | except StopIteration: |
| 1687 | # Consume to *stop*. |
| 1688 | for i, element in zip(range(i + 1, stop), iterable): |
| 1689 | pass |
| 1690 | |
| 1691 | def test_islice_recipe(self): |
| 1692 | self.assertEqual(list(self.islice('ABCDEFG', 2)), list('AB')) |
| 1693 | self.assertEqual(list(self.islice('ABCDEFG', 2, 4)), list('CD')) |
| 1694 | self.assertEqual(list(self.islice('ABCDEFG', 2, None)), list('CDEFG')) |
| 1695 | self.assertEqual(list(self.islice('ABCDEFG', 0, None, 2)), list('ACEG')) |
| 1696 | # Test items consumed. |
| 1697 | it = iter(range(10)) |
| 1698 | self.assertEqual(list(self.islice(it, 3)), list(range(3))) |
| 1699 | self.assertEqual(list(it), list(range(3, 10))) |
| 1700 | it = iter(range(10)) |
| 1701 | self.assertEqual(list(self.islice(it, 3, 3)), []) |
| 1702 | self.assertEqual(list(it), list(range(3, 10))) |
| 1703 | # Test that slice finishes in predictable state. |
| 1704 | c = count() |
| 1705 | self.assertEqual(list(self.islice(c, 1, 3, 50)), [1]) |
| 1706 | self.assertEqual(next(c), 3) |
| 1707 | |
| 1708 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1709 | class TestGC(unittest.TestCase): |
| 1710 | |
| 1711 | def makecycle(self, iterator, container): |
| 1712 | container.append(iterator) |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1713 | next(iterator) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1714 | del container, iterator |
| 1715 | |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 1716 | def test_accumulate(self): |
| 1717 | a = [] |
| 1718 | self.makecycle(accumulate([1,2,a,3]), a) |
| 1719 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1720 | def test_chain(self): |
| 1721 | a = [] |
| 1722 | self.makecycle(chain(a), a) |
| 1723 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1724 | def test_chain_from_iterable(self): |
| 1725 | a = [] |
| 1726 | self.makecycle(chain.from_iterable([a]), a) |
| 1727 | |
| 1728 | def test_combinations(self): |
| 1729 | a = [] |
| 1730 | self.makecycle(combinations([1,2,a,3], 3), a) |
| 1731 | |
Raymond Hettinger | d07d939 | 2009-01-27 04:20:44 +0000 | [diff] [blame] | 1732 | def test_combinations_with_replacement(self): |
| 1733 | a = [] |
| 1734 | self.makecycle(combinations_with_replacement([1,2,a,3], 3), a) |
| 1735 | |
Raymond Hettinger | 6b3b0fc | 2009-01-26 02:56:58 +0000 | [diff] [blame] | 1736 | def test_compress(self): |
| 1737 | a = [] |
| 1738 | self.makecycle(compress('ABCDEF', [1,0,1,0,1,0]), a) |
| 1739 | |
Raymond Hettinger | d6280f4 | 2009-02-16 20:50:56 +0000 | [diff] [blame] | 1740 | def test_count(self): |
| 1741 | a = [] |
| 1742 | Int = type('Int', (int,), dict(x=a)) |
| 1743 | self.makecycle(count(Int(0), Int(1)), a) |
| 1744 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1745 | def test_cycle(self): |
| 1746 | a = [] |
| 1747 | self.makecycle(cycle([a]*2), a) |
| 1748 | |
Raymond Hettinger | ff5dc0e | 2004-09-29 11:40:50 +0000 | [diff] [blame] | 1749 | def test_dropwhile(self): |
| 1750 | a = [] |
| 1751 | self.makecycle(dropwhile(bool, [0, a, a]), a) |
| 1752 | |
| 1753 | def test_groupby(self): |
| 1754 | a = [] |
| 1755 | self.makecycle(groupby([a]*2, lambda x:x), a) |
| 1756 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1757 | def test_issue2246(self): |
| 1758 | # Issue 2246 -- the _grouper iterator was not included in GC |
| 1759 | n = 10 |
| 1760 | keyfunc = lambda x: x |
| 1761 | for i, j in groupby(range(n), key=keyfunc): |
| 1762 | keyfunc.__dict__.setdefault('x',[]).append(j) |
| 1763 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1764 | def test_filter(self): |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1765 | a = [] |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1766 | self.makecycle(filter(lambda x:True, [a]*2), a) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1767 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 1768 | def test_filterfalse(self): |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1769 | a = [] |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 1770 | self.makecycle(filterfalse(lambda x:False, a), a) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1771 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1772 | def test_zip(self): |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1773 | a = [] |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1774 | self.makecycle(zip([a]*2, [a]*3), a) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1775 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1776 | def test_zip_longest(self): |
| 1777 | a = [] |
| 1778 | self.makecycle(zip_longest([a]*2, [a]*3), a) |
| 1779 | b = [a, None] |
| 1780 | self.makecycle(zip_longest([a]*2, [a]*3, fillvalue=b), a) |
| 1781 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1782 | def test_map(self): |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1783 | a = [] |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1784 | self.makecycle(map(lambda x:x, [a]*2), a) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1785 | |
| 1786 | def test_islice(self): |
| 1787 | a = [] |
| 1788 | self.makecycle(islice([a]*2, None), a) |
| 1789 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 1790 | def test_permutations(self): |
| 1791 | a = [] |
| 1792 | self.makecycle(permutations([1,2,a,3], 3), a) |
| 1793 | |
| 1794 | def test_product(self): |
| 1795 | a = [] |
| 1796 | self.makecycle(product([1,2,a,3], repeat=3), a) |
| 1797 | |
Raymond Hettinger | ff5dc0e | 2004-09-29 11:40:50 +0000 | [diff] [blame] | 1798 | def test_repeat(self): |
| 1799 | a = [] |
| 1800 | self.makecycle(repeat(a), a) |
| 1801 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 1802 | def test_starmap(self): |
| 1803 | a = [] |
| 1804 | self.makecycle(starmap(lambda *t: t, [(a,a)]*2), a) |
| 1805 | |
Raymond Hettinger | ff5dc0e | 2004-09-29 11:40:50 +0000 | [diff] [blame] | 1806 | def test_takewhile(self): |
| 1807 | a = [] |
| 1808 | self.makecycle(takewhile(bool, [1, 0, a, a]), a) |
| 1809 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1810 | def R(seqn): |
| 1811 | 'Regular generator' |
| 1812 | for i in seqn: |
| 1813 | yield i |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 1814 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1815 | class G: |
| 1816 | 'Sequence using __getitem__' |
| 1817 | def __init__(self, seqn): |
| 1818 | self.seqn = seqn |
| 1819 | def __getitem__(self, i): |
| 1820 | return self.seqn[i] |
| 1821 | |
| 1822 | class I: |
| 1823 | 'Sequence using iterator protocol' |
| 1824 | def __init__(self, seqn): |
| 1825 | self.seqn = seqn |
| 1826 | self.i = 0 |
| 1827 | def __iter__(self): |
| 1828 | return self |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1829 | def __next__(self): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1830 | if self.i >= len(self.seqn): raise StopIteration |
| 1831 | v = self.seqn[self.i] |
| 1832 | self.i += 1 |
| 1833 | return v |
| 1834 | |
| 1835 | class Ig: |
| 1836 | 'Sequence using iterator protocol defined with a generator' |
| 1837 | def __init__(self, seqn): |
| 1838 | self.seqn = seqn |
| 1839 | self.i = 0 |
| 1840 | def __iter__(self): |
| 1841 | for val in self.seqn: |
| 1842 | yield val |
| 1843 | |
| 1844 | class X: |
| 1845 | 'Missing __getitem__ and __iter__' |
| 1846 | def __init__(self, seqn): |
| 1847 | self.seqn = seqn |
| 1848 | self.i = 0 |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1849 | def __next__(self): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1850 | if self.i >= len(self.seqn): raise StopIteration |
| 1851 | v = self.seqn[self.i] |
| 1852 | self.i += 1 |
| 1853 | return v |
| 1854 | |
| 1855 | class N: |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1856 | 'Iterator missing __next__()' |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1857 | def __init__(self, seqn): |
| 1858 | self.seqn = seqn |
| 1859 | self.i = 0 |
| 1860 | def __iter__(self): |
| 1861 | return self |
| 1862 | |
| 1863 | class E: |
| 1864 | 'Test propagation of exceptions' |
| 1865 | def __init__(self, seqn): |
| 1866 | self.seqn = seqn |
| 1867 | self.i = 0 |
| 1868 | def __iter__(self): |
| 1869 | return self |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1870 | def __next__(self): |
Raymond Hettinger | ffdb8bb | 2004-09-27 15:29:05 +0000 | [diff] [blame] | 1871 | 3 // 0 |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1872 | |
| 1873 | class S: |
| 1874 | 'Test immediate stop' |
| 1875 | def __init__(self, seqn): |
| 1876 | pass |
| 1877 | def __iter__(self): |
| 1878 | return self |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 1879 | def __next__(self): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1880 | raise StopIteration |
| 1881 | |
| 1882 | def L(seqn): |
| 1883 | 'Test multiple tiers of iterators' |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1884 | return chain(map(lambda x:x, R(Ig(G(seqn))))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1885 | |
| 1886 | |
| 1887 | class TestVariousIteratorArgs(unittest.TestCase): |
| 1888 | |
Raymond Hettinger | 482ba77 | 2010-12-01 22:48:00 +0000 | [diff] [blame] | 1889 | def test_accumulate(self): |
| 1890 | s = [1,2,3,4,5] |
| 1891 | r = [1,3,6,10,15] |
| 1892 | n = len(s) |
| 1893 | for g in (G, I, Ig, L, R): |
| 1894 | self.assertEqual(list(accumulate(g(s))), r) |
| 1895 | self.assertEqual(list(accumulate(S(s))), []) |
| 1896 | self.assertRaises(TypeError, accumulate, X(s)) |
| 1897 | self.assertRaises(TypeError, accumulate, N(s)) |
| 1898 | self.assertRaises(ZeroDivisionError, list, accumulate(E(s))) |
| 1899 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1900 | def test_chain(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1901 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1902 | for g in (G, I, Ig, S, L, R): |
| 1903 | self.assertEqual(list(chain(g(s))), list(g(s))) |
| 1904 | self.assertEqual(list(chain(g(s), g(s))), list(g(s))+list(g(s))) |
Christian Heimes | f16baeb | 2008-02-29 14:57:44 +0000 | [diff] [blame] | 1905 | self.assertRaises(TypeError, list, chain(X(s))) |
Mark Dickinson | 26a96fa | 2008-03-01 02:27:46 +0000 | [diff] [blame] | 1906 | self.assertRaises(TypeError, list, chain(N(s))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1907 | self.assertRaises(ZeroDivisionError, list, chain(E(s))) |
| 1908 | |
Raymond Hettinger | 6b3b0fc | 2009-01-26 02:56:58 +0000 | [diff] [blame] | 1909 | def test_compress(self): |
| 1910 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
| 1911 | n = len(s) |
| 1912 | for g in (G, I, Ig, S, L, R): |
| 1913 | self.assertEqual(list(compress(g(s), repeat(1))), list(g(s))) |
| 1914 | self.assertRaises(TypeError, compress, X(s), repeat(1)) |
| 1915 | self.assertRaises(TypeError, compress, N(s), repeat(1)) |
| 1916 | self.assertRaises(ZeroDivisionError, list, compress(E(s), repeat(1))) |
| 1917 | |
Christian Heimes | c3f30c4 | 2008-02-22 16:37:40 +0000 | [diff] [blame] | 1918 | def test_product(self): |
| 1919 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
| 1920 | self.assertRaises(TypeError, product, X(s)) |
| 1921 | self.assertRaises(TypeError, product, N(s)) |
| 1922 | self.assertRaises(ZeroDivisionError, product, E(s)) |
| 1923 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1924 | def test_cycle(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1925 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1926 | for g in (G, I, Ig, S, L, R): |
| 1927 | tgtlen = len(s) * 3 |
| 1928 | expected = list(g(s))*3 |
| 1929 | actual = list(islice(cycle(g(s)), tgtlen)) |
| 1930 | self.assertEqual(actual, expected) |
| 1931 | self.assertRaises(TypeError, cycle, X(s)) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 1932 | self.assertRaises(TypeError, cycle, N(s)) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1933 | self.assertRaises(ZeroDivisionError, list, cycle(E(s))) |
| 1934 | |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 1935 | def test_groupby(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1936 | for s in (range(10), range(0), range(1000), (7,11), range(2000,2200,5)): |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 1937 | for g in (G, I, Ig, S, L, R): |
| 1938 | self.assertEqual([k for k, sb in groupby(g(s))], list(g(s))) |
| 1939 | self.assertRaises(TypeError, groupby, X(s)) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 1940 | self.assertRaises(TypeError, groupby, N(s)) |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 1941 | self.assertRaises(ZeroDivisionError, list, groupby(E(s))) |
| 1942 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1943 | def test_filter(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1944 | for s in (range(10), range(0), range(1000), (7,11), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1945 | for g in (G, I, Ig, S, L, R): |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1946 | self.assertEqual(list(filter(isEven, g(s))), |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 1947 | [x for x in g(s) if isEven(x)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1948 | self.assertRaises(TypeError, filter, isEven, X(s)) |
| 1949 | self.assertRaises(TypeError, filter, isEven, N(s)) |
| 1950 | self.assertRaises(ZeroDivisionError, list, filter(isEven, E(s))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1951 | |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 1952 | def test_filterfalse(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1953 | for s in (range(10), range(0), range(1000), (7,11), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1954 | for g in (G, I, Ig, S, L, R): |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 1955 | self.assertEqual(list(filterfalse(isEven, g(s))), |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 1956 | [x for x in g(s) if isOdd(x)]) |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 1957 | self.assertRaises(TypeError, filterfalse, isEven, X(s)) |
| 1958 | self.assertRaises(TypeError, filterfalse, isEven, N(s)) |
| 1959 | self.assertRaises(ZeroDivisionError, list, filterfalse(isEven, E(s))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1960 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1961 | def test_zip(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1962 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1963 | for g in (G, I, Ig, S, L, R): |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1964 | self.assertEqual(list(zip(g(s))), lzip(g(s))) |
| 1965 | self.assertEqual(list(zip(g(s), g(s))), lzip(g(s), g(s))) |
| 1966 | self.assertRaises(TypeError, zip, X(s)) |
| 1967 | self.assertRaises(TypeError, zip, N(s)) |
| 1968 | self.assertRaises(ZeroDivisionError, list, zip(E(s))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1969 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1970 | def test_ziplongest(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1971 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 1972 | for g in (G, I, Ig, S, L, R): |
Raymond Hettinger | b0002d2 | 2008-03-13 01:41:43 +0000 | [diff] [blame] | 1973 | self.assertEqual(list(zip_longest(g(s))), list(zip(g(s)))) |
| 1974 | self.assertEqual(list(zip_longest(g(s), g(s))), list(zip(g(s), g(s)))) |
| 1975 | self.assertRaises(TypeError, zip_longest, X(s)) |
| 1976 | self.assertRaises(TypeError, zip_longest, N(s)) |
| 1977 | self.assertRaises(ZeroDivisionError, list, zip_longest(E(s))) |
Thomas Wouters | cf297e4 | 2007-02-23 15:07:44 +0000 | [diff] [blame] | 1978 | |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1979 | def test_map(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1980 | for s in (range(10), range(0), range(100), (7,11), range(20,50,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1981 | for g in (G, I, Ig, S, L, R): |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1982 | self.assertEqual(list(map(onearg, g(s))), |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 1983 | [onearg(x) for x in g(s)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1984 | self.assertEqual(list(map(operator.pow, g(s), g(s))), |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 1985 | [x**x for x in g(s)]) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 1986 | self.assertRaises(TypeError, map, onearg, X(s)) |
| 1987 | self.assertRaises(TypeError, map, onearg, N(s)) |
| 1988 | self.assertRaises(ZeroDivisionError, list, map(onearg, E(s))) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1989 | |
| 1990 | def test_islice(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1991 | for s in ("12345", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1992 | for g in (G, I, Ig, S, L, R): |
| 1993 | self.assertEqual(list(islice(g(s),1,None,2)), list(g(s))[1::2]) |
| 1994 | self.assertRaises(TypeError, islice, X(s), 10) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 1995 | self.assertRaises(TypeError, islice, N(s), 10) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 1996 | self.assertRaises(ZeroDivisionError, list, islice(E(s), 10)) |
| 1997 | |
| 1998 | def test_starmap(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 1999 | for s in (range(10), range(0), range(100), (7,11), range(20,50,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2000 | for g in (G, I, Ig, S, L, R): |
Guido van Rossum | 801f0d7 | 2006-08-24 19:48:10 +0000 | [diff] [blame] | 2001 | ss = lzip(s, s) |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 2002 | self.assertEqual(list(starmap(operator.pow, g(ss))), |
| 2003 | [x**x for x in g(s)]) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2004 | self.assertRaises(TypeError, starmap, operator.pow, X(ss)) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 2005 | self.assertRaises(TypeError, starmap, operator.pow, N(ss)) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2006 | self.assertRaises(ZeroDivisionError, list, starmap(operator.pow, E(ss))) |
| 2007 | |
| 2008 | def test_takewhile(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 2009 | for s in (range(10), range(0), range(1000), (7,11), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2010 | for g in (G, I, Ig, S, L, R): |
| 2011 | tgt = [] |
| 2012 | for elem in g(s): |
| 2013 | if not isEven(elem): break |
| 2014 | tgt.append(elem) |
| 2015 | self.assertEqual(list(takewhile(isEven, g(s))), tgt) |
| 2016 | self.assertRaises(TypeError, takewhile, isEven, X(s)) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 2017 | self.assertRaises(TypeError, takewhile, isEven, N(s)) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2018 | self.assertRaises(ZeroDivisionError, list, takewhile(isEven, E(s))) |
| 2019 | |
| 2020 | def test_dropwhile(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 2021 | for s in (range(10), range(0), range(1000), (7,11), range(2000,2200,5)): |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2022 | for g in (G, I, Ig, S, L, R): |
| 2023 | tgt = [] |
| 2024 | for elem in g(s): |
| 2025 | if not tgt and isOdd(elem): continue |
| 2026 | tgt.append(elem) |
| 2027 | self.assertEqual(list(dropwhile(isOdd, g(s))), tgt) |
| 2028 | self.assertRaises(TypeError, dropwhile, isOdd, X(s)) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 2029 | self.assertRaises(TypeError, dropwhile, isOdd, N(s)) |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2030 | self.assertRaises(ZeroDivisionError, list, dropwhile(isOdd, E(s))) |
| 2031 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2032 | def test_tee(self): |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 2033 | for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)): |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2034 | for g in (G, I, Ig, S, L, R): |
| 2035 | it1, it2 = tee(g(s)) |
| 2036 | self.assertEqual(list(it1), list(g(s))) |
| 2037 | self.assertEqual(list(it2), list(g(s))) |
| 2038 | self.assertRaises(TypeError, tee, X(s)) |
Thomas Wouters | 8690c4e | 2006-04-15 09:07:20 +0000 | [diff] [blame] | 2039 | self.assertRaises(TypeError, tee, N(s)) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2040 | self.assertRaises(ZeroDivisionError, list, tee(E(s))[0]) |
| 2041 | |
Raymond Hettinger | 5cab2e3 | 2004-02-10 09:25:40 +0000 | [diff] [blame] | 2042 | class LengthTransparency(unittest.TestCase): |
| 2043 | |
| 2044 | def test_repeat(self): |
Armin Ronacher | aa9a79d | 2012-10-06 14:03:24 +0200 | [diff] [blame] | 2045 | self.assertEqual(operator.length_hint(repeat(None, 50)), 50) |
Raymond Hettinger | 97d3555 | 2014-06-24 21:36:58 -0700 | [diff] [blame] | 2046 | self.assertEqual(operator.length_hint(repeat(None, 0)), 0) |
Armin Ronacher | aa9a79d | 2012-10-06 14:03:24 +0200 | [diff] [blame] | 2047 | self.assertEqual(operator.length_hint(repeat(None), 12), 12) |
Raymond Hettinger | 5cab2e3 | 2004-02-10 09:25:40 +0000 | [diff] [blame] | 2048 | |
Raymond Hettinger | 97d3555 | 2014-06-24 21:36:58 -0700 | [diff] [blame] | 2049 | def test_repeat_with_negative_times(self): |
| 2050 | self.assertEqual(operator.length_hint(repeat(None, -1)), 0) |
| 2051 | self.assertEqual(operator.length_hint(repeat(None, -2)), 0) |
| 2052 | self.assertEqual(operator.length_hint(repeat(None, times=-1)), 0) |
| 2053 | self.assertEqual(operator.length_hint(repeat(None, times=-2)), 0) |
| 2054 | |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 2055 | class RegressionTests(unittest.TestCase): |
| 2056 | |
| 2057 | def test_sf_793826(self): |
| 2058 | # Fix Armin Rigo's successful efforts to wreak havoc |
| 2059 | |
| 2060 | def mutatingtuple(tuple1, f, tuple2): |
| 2061 | # this builds a tuple t which is a copy of tuple1, |
| 2062 | # then calls f(t), then mutates t to be equal to tuple2 |
| 2063 | # (needs len(tuple1) == len(tuple2)). |
| 2064 | def g(value, first=[1]): |
| 2065 | if first: |
| 2066 | del first[:] |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 2067 | f(next(z)) |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 2068 | return value |
| 2069 | items = list(tuple2) |
| 2070 | items[1:1] = list(tuple1) |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2071 | gen = map(g, items) |
| 2072 | z = zip(*[gen]*len(tuple1)) |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 2073 | next(z) |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 2074 | |
| 2075 | def f(t): |
| 2076 | global T |
| 2077 | T = t |
| 2078 | first[:] = list(T) |
| 2079 | |
| 2080 | first = [] |
| 2081 | mutatingtuple((1,2,3), f, (4,5,6)) |
| 2082 | second = list(T) |
| 2083 | self.assertEqual(first, second) |
| 2084 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2085 | |
Raymond Hettinger | 9d7c870 | 2004-05-08 19:49:42 +0000 | [diff] [blame] | 2086 | def test_sf_950057(self): |
| 2087 | # Make sure that chain() and cycle() catch exceptions immediately |
| 2088 | # rather than when shifting between input sources |
| 2089 | |
| 2090 | def gen1(): |
| 2091 | hist.append(0) |
| 2092 | yield 1 |
| 2093 | hist.append(1) |
Tim Peters | beb7c0c | 2004-07-18 17:34:03 +0000 | [diff] [blame] | 2094 | raise AssertionError |
Raymond Hettinger | 9d7c870 | 2004-05-08 19:49:42 +0000 | [diff] [blame] | 2095 | hist.append(2) |
| 2096 | |
| 2097 | def gen2(x): |
| 2098 | hist.append(3) |
| 2099 | yield 2 |
| 2100 | hist.append(4) |
Raymond Hettinger | 9d7c870 | 2004-05-08 19:49:42 +0000 | [diff] [blame] | 2101 | |
| 2102 | hist = [] |
| 2103 | self.assertRaises(AssertionError, list, chain(gen1(), gen2(False))) |
| 2104 | self.assertEqual(hist, [0,1]) |
| 2105 | |
| 2106 | hist = [] |
| 2107 | self.assertRaises(AssertionError, list, chain(gen1(), gen2(True))) |
| 2108 | self.assertEqual(hist, [0,1]) |
| 2109 | |
| 2110 | hist = [] |
| 2111 | self.assertRaises(AssertionError, list, cycle(gen1())) |
| 2112 | self.assertEqual(hist, [0,1]) |
| 2113 | |
Miss Islington (bot) | 382cb85 | 2019-07-30 11:34:33 -0700 | [diff] [blame] | 2114 | @support.skip_if_pgo_task |
T. Wouters | 5466d4a | 2017-03-30 09:58:35 -0700 | [diff] [blame] | 2115 | def test_long_chain_of_empty_iterables(self): |
| 2116 | # Make sure itertools.chain doesn't run into recursion limits when |
| 2117 | # dealing with long chains of empty iterables. Even with a high |
| 2118 | # number this would probably only fail in Py_DEBUG mode. |
| 2119 | it = chain.from_iterable(() for unused in range(10000000)) |
| 2120 | with self.assertRaises(StopIteration): |
| 2121 | next(it) |
| 2122 | |
Serhiy Storchaka | c740e4f | 2017-09-26 21:47:56 +0300 | [diff] [blame] | 2123 | def test_issue30347_1(self): |
| 2124 | def f(n): |
| 2125 | if n == 5: |
| 2126 | list(b) |
| 2127 | return n != 6 |
| 2128 | for (k, b) in groupby(range(10), f): |
| 2129 | list(b) # shouldn't crash |
| 2130 | |
| 2131 | def test_issue30347_2(self): |
| 2132 | class K: |
| 2133 | def __init__(self, v): |
| 2134 | pass |
| 2135 | def __eq__(self, other): |
| 2136 | nonlocal i |
| 2137 | i += 1 |
| 2138 | if i == 1: |
| 2139 | next(g, None) |
| 2140 | return True |
| 2141 | i = 0 |
| 2142 | g = next(groupby(range(10), K))[1] |
| 2143 | for j in range(2): |
| 2144 | next(g, None) # shouldn't crash |
| 2145 | |
| 2146 | |
Thomas Wouters | b213704 | 2007-02-01 18:02:27 +0000 | [diff] [blame] | 2147 | class SubclassWithKwargsTest(unittest.TestCase): |
| 2148 | def test_keywords_in_subclass(self): |
| 2149 | # count is not subclassable... |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2150 | for cls in (repeat, zip, filter, filterfalse, chain, map, |
Raymond Hettinger | 6b3b0fc | 2009-01-26 02:56:58 +0000 | [diff] [blame] | 2151 | starmap, islice, takewhile, dropwhile, cycle, compress): |
Thomas Wouters | b213704 | 2007-02-01 18:02:27 +0000 | [diff] [blame] | 2152 | class Subclass(cls): |
| 2153 | def __init__(self, newarg=None, *args): |
| 2154 | cls.__init__(self, *args) |
| 2155 | try: |
| 2156 | Subclass(newarg=1) |
| 2157 | except TypeError as err: |
| 2158 | # we expect type errors because of wrong argument count |
Serhiy Storchaka | 5eb788b | 2017-06-06 18:45:22 +0300 | [diff] [blame] | 2159 | self.assertNotIn("keyword arguments", err.args[0]) |
Thomas Wouters | b213704 | 2007-02-01 18:02:27 +0000 | [diff] [blame] | 2160 | |
Serhiy Storchaka | 2dae92a | 2013-12-09 17:45:57 +0200 | [diff] [blame] | 2161 | @support.cpython_only |
| 2162 | class SizeofTest(unittest.TestCase): |
| 2163 | def setUp(self): |
| 2164 | self.ssize_t = struct.calcsize('n') |
| 2165 | |
| 2166 | check_sizeof = support.check_sizeof |
| 2167 | |
| 2168 | def test_product_sizeof(self): |
| 2169 | basesize = support.calcobjsize('3Pi') |
| 2170 | check = self.check_sizeof |
| 2171 | check(product('ab', '12'), basesize + 2 * self.ssize_t) |
| 2172 | check(product(*(('abc',) * 10)), basesize + 10 * self.ssize_t) |
| 2173 | |
| 2174 | def test_combinations_sizeof(self): |
| 2175 | basesize = support.calcobjsize('3Pni') |
| 2176 | check = self.check_sizeof |
| 2177 | check(combinations('abcd', 3), basesize + 3 * self.ssize_t) |
| 2178 | check(combinations(range(10), 4), basesize + 4 * self.ssize_t) |
| 2179 | |
| 2180 | def test_combinations_with_replacement_sizeof(self): |
| 2181 | cwr = combinations_with_replacement |
| 2182 | basesize = support.calcobjsize('3Pni') |
| 2183 | check = self.check_sizeof |
| 2184 | check(cwr('abcd', 3), basesize + 3 * self.ssize_t) |
| 2185 | check(cwr(range(10), 4), basesize + 4 * self.ssize_t) |
| 2186 | |
| 2187 | def test_permutations_sizeof(self): |
| 2188 | basesize = support.calcobjsize('4Pni') |
| 2189 | check = self.check_sizeof |
| 2190 | check(permutations('abcd'), |
| 2191 | basesize + 4 * self.ssize_t + 4 * self.ssize_t) |
| 2192 | check(permutations('abcd', 3), |
| 2193 | basesize + 4 * self.ssize_t + 3 * self.ssize_t) |
| 2194 | check(permutations('abcde', 3), |
| 2195 | basesize + 5 * self.ssize_t + 3 * self.ssize_t) |
| 2196 | check(permutations(range(10), 4), |
| 2197 | basesize + 10 * self.ssize_t + 4 * self.ssize_t) |
| 2198 | |
Thomas Wouters | b213704 | 2007-02-01 18:02:27 +0000 | [diff] [blame] | 2199 | |
Raymond Hettinger | f0fa1c0 | 2003-05-29 07:18:57 +0000 | [diff] [blame] | 2200 | libreftest = """ Doctest for examples in the library reference: libitertools.tex |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2201 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2202 | |
| 2203 | >>> amounts = [120.15, 764.05, 823.14] |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2204 | >>> for checknum, amount in zip(count(1200), amounts): |
Guido van Rossum | 7131f84 | 2007-02-09 20:13:25 +0000 | [diff] [blame] | 2205 | ... print('Check %d is for $%.2f' % (checknum, amount)) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 2206 | ... |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2207 | Check 1200 is for $120.15 |
| 2208 | Check 1201 is for $764.05 |
| 2209 | Check 1202 is for $823.14 |
| 2210 | |
| 2211 | >>> import operator |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2212 | >>> for cube in map(operator.pow, range(1,4), repeat(3)): |
Guido van Rossum | 7131f84 | 2007-02-09 20:13:25 +0000 | [diff] [blame] | 2213 | ... print(cube) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 2214 | ... |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2215 | 1 |
| 2216 | 8 |
| 2217 | 27 |
| 2218 | |
| 2219 | >>> reportlines = ['EuroPython', 'Roster', '', 'alex', '', 'laura', '', 'martin', '', 'walter', '', 'samuele'] |
Raymond Hettinger | 3567a87 | 2003-06-28 05:44:36 +0000 | [diff] [blame] | 2220 | >>> for name in islice(reportlines, 3, None, 2): |
Guido van Rossum | 7131f84 | 2007-02-09 20:13:25 +0000 | [diff] [blame] | 2221 | ... print(name.title()) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 2222 | ... |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2223 | Alex |
| 2224 | Laura |
| 2225 | Martin |
| 2226 | Walter |
| 2227 | Samuele |
| 2228 | |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 2229 | >>> from operator import itemgetter |
| 2230 | >>> d = dict(a=1, b=2, c=1, d=2, e=1, f=2, g=3) |
Guido van Rossum | cc2b016 | 2007-02-11 06:12:03 +0000 | [diff] [blame] | 2231 | >>> di = sorted(sorted(d.items()), key=itemgetter(1)) |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 2232 | >>> for k, g in groupby(di, itemgetter(1)): |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 2233 | ... print(k, list(map(itemgetter(0), g))) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 2234 | ... |
Raymond Hettinger | d25c1c6 | 2003-12-06 16:23:06 +0000 | [diff] [blame] | 2235 | 1 ['a', 'c', 'e'] |
| 2236 | 2 ['b', 'd', 'f'] |
| 2237 | 3 ['g'] |
| 2238 | |
Raymond Hettinger | 734fb57 | 2004-01-20 20:04:40 +0000 | [diff] [blame] | 2239 | # Find runs of consecutive numbers using groupby. The key to the solution |
| 2240 | # is differencing with a range so that consecutive numbers all appear in |
| 2241 | # same group. |
| 2242 | >>> data = [ 1, 4,5,6, 10, 15,16,17,18, 22, 25,26,27,28] |
Guido van Rossum | 1bc535d | 2007-05-15 18:46:22 +0000 | [diff] [blame] | 2243 | >>> for k, g in groupby(enumerate(data), lambda t:t[0]-t[1]): |
Guido van Rossum | c1f779c | 2007-07-03 08:25:58 +0000 | [diff] [blame] | 2244 | ... print(list(map(operator.itemgetter(1), g))) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 2245 | ... |
Raymond Hettinger | 734fb57 | 2004-01-20 20:04:40 +0000 | [diff] [blame] | 2246 | [1] |
| 2247 | [4, 5, 6] |
| 2248 | [10] |
| 2249 | [15, 16, 17, 18] |
| 2250 | [22] |
| 2251 | [25, 26, 27, 28] |
| 2252 | |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2253 | >>> def take(n, iterable): |
| 2254 | ... "Return first n items of the iterable as a list" |
| 2255 | ... return list(islice(iterable, n)) |
Raymond Hettinger | a098b33 | 2003-09-08 23:58:40 +0000 | [diff] [blame] | 2256 | |
Raymond Hettinger | 9265dd7 | 2018-04-08 08:44:20 -0700 | [diff] [blame] | 2257 | >>> def prepend(value, iterator): |
| 2258 | ... "Prepend a single value in front of an iterator" |
| 2259 | ... # prepend(1, [2, 3, 4]) -> 1 2 3 4 |
| 2260 | ... return chain([value], iterator) |
| 2261 | |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2262 | >>> def enumerate(iterable, start=0): |
| 2263 | ... return zip(count(start), iterable) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2264 | |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2265 | >>> def tabulate(function, start=0): |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2266 | ... "Return function(0), function(1), ..." |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2267 | ... return map(function, count(start)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2268 | |
Cheryl Sabella | da1734c | 2018-03-26 21:29:33 -0400 | [diff] [blame] | 2269 | >>> import collections |
| 2270 | >>> def consume(iterator, n=None): |
| 2271 | ... "Advance the iterator n-steps ahead. If n is None, consume entirely." |
| 2272 | ... # Use functions that consume iterators at C speed. |
| 2273 | ... if n is None: |
| 2274 | ... # feed the entire iterator into a zero-length deque |
| 2275 | ... collections.deque(iterator, maxlen=0) |
| 2276 | ... else: |
| 2277 | ... # advance to the empty slice starting at position n |
| 2278 | ... next(islice(iterator, n, n), None) |
| 2279 | |
Raymond Hettinger | cdf8ba3 | 2009-02-19 04:45:07 +0000 | [diff] [blame] | 2280 | >>> def nth(iterable, n, default=None): |
| 2281 | ... "Returns the nth item or a default value" |
| 2282 | ... return next(islice(iterable, n, None), default) |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2283 | |
Raymond Hettinger | e525ee3 | 2016-03-06 18:11:38 -0800 | [diff] [blame] | 2284 | >>> def all_equal(iterable): |
| 2285 | ... "Returns True if all the elements are equal to each other" |
| 2286 | ... g = groupby(iterable) |
| 2287 | ... return next(g, True) and not next(g, False) |
| 2288 | |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2289 | >>> def quantify(iterable, pred=bool): |
| 2290 | ... "Count how many times the predicate is true" |
| 2291 | ... return sum(map(pred, iterable)) |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2292 | |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2293 | >>> def padnone(iterable): |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2294 | ... "Returns the sequence elements and then returns None indefinitely" |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2295 | ... return chain(iterable, repeat(None)) |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2296 | |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2297 | >>> def ncycles(iterable, n): |
Ezio Melotti | 1392500 | 2011-03-16 11:05:33 +0200 | [diff] [blame] | 2298 | ... "Returns the sequence elements n times" |
Georg Brandl | 3dbca81 | 2008-07-23 16:10:53 +0000 | [diff] [blame] | 2299 | ... return chain(*repeat(iterable, n)) |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2300 | |
| 2301 | >>> def dotproduct(vec1, vec2): |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2302 | ... return sum(map(operator.mul, vec1, vec2)) |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2303 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2304 | >>> def flatten(listOfLists): |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2305 | ... return list(chain.from_iterable(listOfLists)) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2306 | |
| 2307 | >>> def repeatfunc(func, times=None, *args): |
| 2308 | ... "Repeat calls to func with specified arguments." |
| 2309 | ... " Example: repeatfunc(random.random)" |
| 2310 | ... if times is None: |
| 2311 | ... return starmap(func, repeat(args)) |
| 2312 | ... else: |
| 2313 | ... return starmap(func, repeat(args, times)) |
| 2314 | |
Raymond Hettinger | d591f66 | 2003-10-26 15:34:50 +0000 | [diff] [blame] | 2315 | >>> def pairwise(iterable): |
| 2316 | ... "s -> (s0,s1), (s1,s2), (s2, s3), ..." |
| 2317 | ... a, b = tee(iterable) |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 2318 | ... try: |
Georg Brandl | a18af4e | 2007-04-21 15:47:16 +0000 | [diff] [blame] | 2319 | ... next(b) |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 2320 | ... except StopIteration: |
| 2321 | ... pass |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2322 | ... return zip(a, b) |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2323 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2324 | >>> def grouper(n, iterable, fillvalue=None): |
Raymond Hettinger | f5a2e47 | 2008-07-30 07:37:37 +0000 | [diff] [blame] | 2325 | ... "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx" |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2326 | ... args = [iter(iterable)] * n |
Raymond Hettinger | 883d276 | 2009-01-27 04:57:51 +0000 | [diff] [blame] | 2327 | ... return zip_longest(*args, fillvalue=fillvalue) |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2328 | |
| 2329 | >>> def roundrobin(*iterables): |
Raymond Hettinger | f5a2e47 | 2008-07-30 07:37:37 +0000 | [diff] [blame] | 2330 | ... "roundrobin('ABC', 'D', 'EF') --> A D E B F C" |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2331 | ... # Recipe credited to George Sakkis |
| 2332 | ... pending = len(iterables) |
| 2333 | ... nexts = cycle(iter(it).__next__ for it in iterables) |
| 2334 | ... while pending: |
| 2335 | ... try: |
| 2336 | ... for next in nexts: |
| 2337 | ... yield next() |
| 2338 | ... except StopIteration: |
| 2339 | ... pending -= 1 |
| 2340 | ... nexts = cycle(islice(nexts, pending)) |
| 2341 | |
| 2342 | >>> def powerset(iterable): |
Raymond Hettinger | ace6733 | 2009-01-26 02:23:50 +0000 | [diff] [blame] | 2343 | ... "powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)" |
| 2344 | ... s = list(iterable) |
| 2345 | ... return chain.from_iterable(combinations(s, r) for r in range(len(s)+1)) |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2346 | |
Raymond Hettinger | ad9d96b | 2009-01-02 21:39:07 +0000 | [diff] [blame] | 2347 | >>> def unique_everseen(iterable, key=None): |
| 2348 | ... "List unique elements, preserving order. Remember all elements ever seen." |
| 2349 | ... # unique_everseen('AAAABBBCCDAABBB') --> A B C D |
| 2350 | ... # unique_everseen('ABBCcAD', str.lower) --> A B C D |
| 2351 | ... seen = set() |
| 2352 | ... seen_add = seen.add |
| 2353 | ... if key is None: |
| 2354 | ... for element in iterable: |
| 2355 | ... if element not in seen: |
| 2356 | ... seen_add(element) |
| 2357 | ... yield element |
| 2358 | ... else: |
| 2359 | ... for element in iterable: |
| 2360 | ... k = key(element) |
| 2361 | ... if k not in seen: |
| 2362 | ... seen_add(k) |
| 2363 | ... yield element |
| 2364 | |
| 2365 | >>> def unique_justseen(iterable, key=None): |
| 2366 | ... "List unique elements, preserving order. Remember only the element just seen." |
| 2367 | ... # unique_justseen('AAAABBBCCDAABBB') --> A B C D A B |
| 2368 | ... # unique_justseen('ABBCcAD', str.lower) --> A B C A D |
| 2369 | ... return map(next, map(itemgetter(1), groupby(iterable, key))) |
| 2370 | |
Raymond Hettinger | 31b26f6 | 2014-04-02 03:16:42 -0700 | [diff] [blame] | 2371 | >>> def first_true(iterable, default=False, pred=None): |
| 2372 | ... '''Returns the first true value in the iterable. |
| 2373 | ... |
| 2374 | ... If no true value is found, returns *default* |
| 2375 | ... |
| 2376 | ... If *pred* is not None, returns the first item |
| 2377 | ... for which pred(item) is true. |
| 2378 | ... |
| 2379 | ... ''' |
| 2380 | ... # first_true([a,b,c], x) --> a or b or c or x |
| 2381 | ... # first_true([a,b], x, f) --> a if f(a) else b if f(b) else x |
| 2382 | ... return next(filter(pred, iterable), default) |
| 2383 | |
Raymond Hettinger | d37258d | 2018-01-13 10:35:40 -0800 | [diff] [blame] | 2384 | >>> def nth_combination(iterable, r, index): |
| 2385 | ... 'Equivalent to list(combinations(iterable, r))[index]' |
| 2386 | ... pool = tuple(iterable) |
| 2387 | ... n = len(pool) |
| 2388 | ... if r < 0 or r > n: |
| 2389 | ... raise ValueError |
| 2390 | ... c = 1 |
| 2391 | ... k = min(r, n-r) |
| 2392 | ... for i in range(1, k+1): |
| 2393 | ... c = c * (n - k + i) // i |
| 2394 | ... if index < 0: |
| 2395 | ... index += c |
| 2396 | ... if index < 0 or index >= c: |
| 2397 | ... raise IndexError |
| 2398 | ... result = [] |
| 2399 | ... while r: |
| 2400 | ... c, n, r = c*r//n, n-1, r-1 |
| 2401 | ... while index >= c: |
| 2402 | ... index -= c |
| 2403 | ... c, n = c*(n-r)//n, n-1 |
| 2404 | ... result.append(pool[-1-n]) |
| 2405 | ... return tuple(result) |
| 2406 | |
| 2407 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2408 | This is not part of the examples but it tests to make sure the definitions |
| 2409 | perform as purported. |
| 2410 | |
Raymond Hettinger | a098b33 | 2003-09-08 23:58:40 +0000 | [diff] [blame] | 2411 | >>> take(10, count()) |
| 2412 | [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
| 2413 | |
Raymond Hettinger | 9265dd7 | 2018-04-08 08:44:20 -0700 | [diff] [blame] | 2414 | >>> list(prepend(1, [2, 3, 4])) |
| 2415 | [1, 2, 3, 4] |
| 2416 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2417 | >>> list(enumerate('abc')) |
| 2418 | [(0, 'a'), (1, 'b'), (2, 'c')] |
| 2419 | |
| 2420 | >>> list(islice(tabulate(lambda x: 2*x), 4)) |
| 2421 | [0, 2, 4, 6] |
| 2422 | |
Cheryl Sabella | da1734c | 2018-03-26 21:29:33 -0400 | [diff] [blame] | 2423 | >>> it = iter(range(10)) |
| 2424 | >>> consume(it, 3) |
| 2425 | >>> next(it) |
| 2426 | 3 |
| 2427 | >>> consume(it) |
| 2428 | >>> next(it, 'Done') |
| 2429 | 'Done' |
| 2430 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2431 | >>> nth('abcde', 3) |
Raymond Hettinger | d04fa31 | 2009-02-04 19:45:13 +0000 | [diff] [blame] | 2432 | 'd' |
| 2433 | |
| 2434 | >>> nth('abcde', 9) is None |
| 2435 | True |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2436 | |
Raymond Hettinger | e525ee3 | 2016-03-06 18:11:38 -0800 | [diff] [blame] | 2437 | >>> [all_equal(s) for s in ('', 'A', 'AAAA', 'AAAB', 'AAABA')] |
| 2438 | [True, True, True, False, False] |
| 2439 | |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 2440 | >>> quantify(range(99), lambda x: x%2==0) |
Raymond Hettinger | b5a4208 | 2003-08-08 05:10:41 +0000 | [diff] [blame] | 2441 | 50 |
| 2442 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2443 | >>> a = [[1, 2, 3], [4, 5, 6]] |
| 2444 | >>> flatten(a) |
| 2445 | [1, 2, 3, 4, 5, 6] |
| 2446 | |
| 2447 | >>> list(repeatfunc(pow, 5, 2, 3)) |
| 2448 | [8, 8, 8, 8, 8] |
| 2449 | |
| 2450 | >>> import random |
Raymond Hettinger | 736c0ab | 2008-03-13 02:09:15 +0000 | [diff] [blame] | 2451 | >>> take(5, map(int, repeatfunc(random.random))) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 2452 | [0, 0, 0, 0, 0] |
| 2453 | |
Raymond Hettinger | d591f66 | 2003-10-26 15:34:50 +0000 | [diff] [blame] | 2454 | >>> list(pairwise('abcd')) |
| 2455 | [('a', 'b'), ('b', 'c'), ('c', 'd')] |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2456 | |
Raymond Hettinger | d591f66 | 2003-10-26 15:34:50 +0000 | [diff] [blame] | 2457 | >>> list(pairwise([])) |
| 2458 | [] |
| 2459 | |
| 2460 | >>> list(pairwise('a')) |
Raymond Hettinger | befa37d | 2003-06-18 19:25:37 +0000 | [diff] [blame] | 2461 | [] |
| 2462 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2463 | >>> list(islice(padnone('abc'), 0, 6)) |
| 2464 | ['a', 'b', 'c', None, None, None] |
| 2465 | |
| 2466 | >>> list(ncycles('abc', 3)) |
| 2467 | ['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c'] |
| 2468 | |
| 2469 | >>> dotproduct([1,2,3], [4,5,6]) |
| 2470 | 32 |
| 2471 | |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2472 | >>> list(grouper(3, 'abcdefg', 'x')) |
| 2473 | [('a', 'b', 'c'), ('d', 'e', 'f'), ('g', 'x', 'x')] |
| 2474 | |
| 2475 | >>> list(roundrobin('abc', 'd', 'ef')) |
| 2476 | ['a', 'd', 'e', 'b', 'f', 'c'] |
| 2477 | |
Raymond Hettinger | ace6733 | 2009-01-26 02:23:50 +0000 | [diff] [blame] | 2478 | >>> list(powerset([1,2,3])) |
| 2479 | [(), (1,), (2,), (3,), (1, 2), (1, 3), (2, 3), (1, 2, 3)] |
Christian Heimes | dd15f6c | 2008-03-16 00:07:10 +0000 | [diff] [blame] | 2480 | |
Raymond Hettinger | 191e850 | 2009-01-27 13:29:43 +0000 | [diff] [blame] | 2481 | >>> all(len(list(powerset(range(n)))) == 2**n for n in range(18)) |
| 2482 | True |
| 2483 | |
| 2484 | >>> list(powerset('abcde')) == sorted(sorted(set(powerset('abcde'))), key=len) |
| 2485 | True |
| 2486 | |
Raymond Hettinger | ad9d96b | 2009-01-02 21:39:07 +0000 | [diff] [blame] | 2487 | >>> list(unique_everseen('AAAABBBCCDAABBB')) |
| 2488 | ['A', 'B', 'C', 'D'] |
| 2489 | |
| 2490 | >>> list(unique_everseen('ABBCcAD', str.lower)) |
| 2491 | ['A', 'B', 'C', 'D'] |
| 2492 | |
| 2493 | >>> list(unique_justseen('AAAABBBCCDAABBB')) |
| 2494 | ['A', 'B', 'C', 'D', 'A', 'B'] |
| 2495 | |
| 2496 | >>> list(unique_justseen('ABBCcAD', str.lower)) |
| 2497 | ['A', 'B', 'C', 'A', 'D'] |
| 2498 | |
Raymond Hettinger | 31b26f6 | 2014-04-02 03:16:42 -0700 | [diff] [blame] | 2499 | >>> first_true('ABC0DEF1', '9', str.isdigit) |
| 2500 | '0' |
| 2501 | |
Raymond Hettinger | d37258d | 2018-01-13 10:35:40 -0800 | [diff] [blame] | 2502 | >>> population = 'ABCDEFGH' |
| 2503 | >>> for r in range(len(population) + 1): |
| 2504 | ... seq = list(combinations(population, r)) |
| 2505 | ... for i in range(len(seq)): |
| 2506 | ... assert nth_combination(population, r, i) == seq[i] |
| 2507 | ... for i in range(-len(seq), 0): |
| 2508 | ... assert nth_combination(population, r, i) == seq[i] |
| 2509 | |
| 2510 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2511 | """ |
| 2512 | |
| 2513 | __test__ = {'libreftest' : libreftest} |
| 2514 | |
| 2515 | def test_main(verbose=None): |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 2516 | test_classes = (TestBasicOps, TestVariousIteratorArgs, TestGC, |
Thomas Wouters | b213704 | 2007-02-01 18:02:27 +0000 | [diff] [blame] | 2517 | RegressionTests, LengthTransparency, |
Serhiy Storchaka | 2dae92a | 2013-12-09 17:45:57 +0200 | [diff] [blame] | 2518 | SubclassWithKwargsTest, TestExamples, |
Cheryl Sabella | da1734c | 2018-03-26 21:29:33 -0400 | [diff] [blame] | 2519 | TestPurePythonRoughEquivalents, |
Serhiy Storchaka | 2dae92a | 2013-12-09 17:45:57 +0200 | [diff] [blame] | 2520 | SizeofTest) |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 2521 | support.run_unittest(*test_classes) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2522 | |
| 2523 | # verify reference counting |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2524 | if verbose and hasattr(sys, "gettotalrefcount"): |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 2525 | import gc |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 2526 | counts = [None] * 5 |
Guido van Rossum | 805365e | 2007-05-07 22:24:25 +0000 | [diff] [blame] | 2527 | for i in range(len(counts)): |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 2528 | support.run_unittest(*test_classes) |
Raymond Hettinger | 0242070 | 2003-06-29 20:36:23 +0000 | [diff] [blame] | 2529 | gc.collect() |
Raymond Hettinger | 8fd3f87 | 2003-05-02 22:38:07 +0000 | [diff] [blame] | 2530 | counts[i] = sys.gettotalrefcount() |
Guido van Rossum | be19ed7 | 2007-02-09 05:37:30 +0000 | [diff] [blame] | 2531 | print(counts) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2532 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2533 | # doctest the examples in the library reference |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 2534 | support.run_doctest(sys.modules[__name__], verbose) |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 2535 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2536 | if __name__ == "__main__": |
| 2537 | test_main(verbose=True) |