| import functools |
| import collections |
| import sys |
| import unittest |
| from test import support |
| from weakref import proxy |
| import pickle |
| from random import choice |
| |
| @staticmethod |
| def PythonPartial(func, *args, **keywords): |
| 'Pure Python approximation of partial()' |
| def newfunc(*fargs, **fkeywords): |
| newkeywords = keywords.copy() |
| newkeywords.update(fkeywords) |
| return func(*(args + fargs), **newkeywords) |
| newfunc.func = func |
| newfunc.args = args |
| newfunc.keywords = keywords |
| return newfunc |
| |
| def capture(*args, **kw): |
| """capture all positional and keyword arguments""" |
| return args, kw |
| |
| def signature(part): |
| """ return the signature of a partial object """ |
| return (part.func, part.args, part.keywords, part.__dict__) |
| |
| class TestPartial(unittest.TestCase): |
| |
| thetype = functools.partial |
| |
| def test_basic_examples(self): |
| p = self.thetype(capture, 1, 2, a=10, b=20) |
| self.assertEqual(p(3, 4, b=30, c=40), |
| ((1, 2, 3, 4), dict(a=10, b=30, c=40))) |
| p = self.thetype(map, lambda x: x*10) |
| self.assertEqual(list(p([1,2,3,4])), [10, 20, 30, 40]) |
| |
| def test_attributes(self): |
| p = self.thetype(capture, 1, 2, a=10, b=20) |
| # attributes should be readable |
| self.assertEqual(p.func, capture) |
| self.assertEqual(p.args, (1, 2)) |
| self.assertEqual(p.keywords, dict(a=10, b=20)) |
| # attributes should not be writable |
| if not isinstance(self.thetype, type): |
| return |
| self.assertRaises(AttributeError, setattr, p, 'func', map) |
| self.assertRaises(AttributeError, setattr, p, 'args', (1, 2)) |
| self.assertRaises(AttributeError, setattr, p, 'keywords', dict(a=1, b=2)) |
| |
| p = self.thetype(hex) |
| try: |
| del p.__dict__ |
| except TypeError: |
| pass |
| else: |
| self.fail('partial object allowed __dict__ to be deleted') |
| |
| def test_argument_checking(self): |
| self.assertRaises(TypeError, self.thetype) # need at least a func arg |
| try: |
| self.thetype(2)() |
| except TypeError: |
| pass |
| else: |
| self.fail('First arg not checked for callability') |
| |
| def test_protection_of_callers_dict_argument(self): |
| # a caller's dictionary should not be altered by partial |
| def func(a=10, b=20): |
| return a |
| d = {'a':3} |
| p = self.thetype(func, a=5) |
| self.assertEqual(p(**d), 3) |
| self.assertEqual(d, {'a':3}) |
| p(b=7) |
| self.assertEqual(d, {'a':3}) |
| |
| def test_arg_combinations(self): |
| # exercise special code paths for zero args in either partial |
| # object or the caller |
| p = self.thetype(capture) |
| self.assertEqual(p(), ((), {})) |
| self.assertEqual(p(1,2), ((1,2), {})) |
| p = self.thetype(capture, 1, 2) |
| self.assertEqual(p(), ((1,2), {})) |
| self.assertEqual(p(3,4), ((1,2,3,4), {})) |
| |
| def test_kw_combinations(self): |
| # exercise special code paths for no keyword args in |
| # either the partial object or the caller |
| p = self.thetype(capture) |
| self.assertEqual(p(), ((), {})) |
| self.assertEqual(p(a=1), ((), {'a':1})) |
| p = self.thetype(capture, a=1) |
| self.assertEqual(p(), ((), {'a':1})) |
| self.assertEqual(p(b=2), ((), {'a':1, 'b':2})) |
| # keyword args in the call override those in the partial object |
| self.assertEqual(p(a=3, b=2), ((), {'a':3, 'b':2})) |
| |
| def test_positional(self): |
| # make sure positional arguments are captured correctly |
| for args in [(), (0,), (0,1), (0,1,2), (0,1,2,3)]: |
| p = self.thetype(capture, *args) |
| expected = args + ('x',) |
| got, empty = p('x') |
| self.assertTrue(expected == got and empty == {}) |
| |
| def test_keyword(self): |
| # make sure keyword arguments are captured correctly |
| for a in ['a', 0, None, 3.5]: |
| p = self.thetype(capture, a=a) |
| expected = {'a':a,'x':None} |
| empty, got = p(x=None) |
| self.assertTrue(expected == got and empty == ()) |
| |
| def test_no_side_effects(self): |
| # make sure there are no side effects that affect subsequent calls |
| p = self.thetype(capture, 0, a=1) |
| args1, kw1 = p(1, b=2) |
| self.assertTrue(args1 == (0,1) and kw1 == {'a':1,'b':2}) |
| args2, kw2 = p() |
| self.assertTrue(args2 == (0,) and kw2 == {'a':1}) |
| |
| def test_error_propagation(self): |
| def f(x, y): |
| x / y |
| self.assertRaises(ZeroDivisionError, self.thetype(f, 1, 0)) |
| self.assertRaises(ZeroDivisionError, self.thetype(f, 1), 0) |
| self.assertRaises(ZeroDivisionError, self.thetype(f), 1, 0) |
| self.assertRaises(ZeroDivisionError, self.thetype(f, y=0), 1) |
| |
| def test_weakref(self): |
| f = self.thetype(int, base=16) |
| p = proxy(f) |
| self.assertEqual(f.func, p.func) |
| f = None |
| self.assertRaises(ReferenceError, getattr, p, 'func') |
| |
| def test_with_bound_and_unbound_methods(self): |
| data = list(map(str, range(10))) |
| join = self.thetype(str.join, '') |
| self.assertEqual(join(data), '0123456789') |
| join = self.thetype(''.join) |
| self.assertEqual(join(data), '0123456789') |
| |
| def test_repr(self): |
| args = (object(), object()) |
| args_repr = ', '.join(repr(a) for a in args) |
| kwargs = {'a': object(), 'b': object()} |
| kwargs_repr = ', '.join("%s=%r" % (k, v) for k, v in kwargs.items()) |
| if self.thetype is functools.partial: |
| name = 'functools.partial' |
| else: |
| name = self.thetype.__name__ |
| |
| f = self.thetype(capture) |
| self.assertEqual('{}({!r})'.format(name, capture), |
| repr(f)) |
| |
| f = self.thetype(capture, *args) |
| self.assertEqual('{}({!r}, {})'.format(name, capture, args_repr), |
| repr(f)) |
| |
| f = self.thetype(capture, **kwargs) |
| self.assertEqual('{}({!r}, {})'.format(name, capture, kwargs_repr), |
| repr(f)) |
| |
| f = self.thetype(capture, *args, **kwargs) |
| self.assertEqual('{}({!r}, {}, {})'.format(name, capture, args_repr, kwargs_repr), |
| repr(f)) |
| |
| def test_pickle(self): |
| f = self.thetype(signature, 'asdf', bar=True) |
| f.add_something_to__dict__ = True |
| f_copy = pickle.loads(pickle.dumps(f)) |
| self.assertEqual(signature(f), signature(f_copy)) |
| |
| class PartialSubclass(functools.partial): |
| pass |
| |
| class TestPartialSubclass(TestPartial): |
| |
| thetype = PartialSubclass |
| |
| class TestPythonPartial(TestPartial): |
| |
| thetype = PythonPartial |
| |
| # the python version hasn't a nice repr |
| def test_repr(self): pass |
| |
| # the python version isn't picklable |
| def test_pickle(self): pass |
| |
| class TestUpdateWrapper(unittest.TestCase): |
| |
| def check_wrapper(self, wrapper, wrapped, |
| assigned=functools.WRAPPER_ASSIGNMENTS, |
| updated=functools.WRAPPER_UPDATES): |
| # Check attributes were assigned |
| for name in assigned: |
| self.assertTrue(getattr(wrapper, name) is getattr(wrapped, name)) |
| # Check attributes were updated |
| for name in updated: |
| wrapper_attr = getattr(wrapper, name) |
| wrapped_attr = getattr(wrapped, name) |
| for key in wrapped_attr: |
| self.assertTrue(wrapped_attr[key] is wrapper_attr[key]) |
| |
| def _default_update(self): |
| def f(a:'This is a new annotation'): |
| """This is a test""" |
| pass |
| f.attr = 'This is also a test' |
| def wrapper(b:'This is the prior annotation'): |
| pass |
| functools.update_wrapper(wrapper, f) |
| return wrapper, f |
| |
| def test_default_update(self): |
| wrapper, f = self._default_update() |
| self.check_wrapper(wrapper, f) |
| self.assertIs(wrapper.__wrapped__, f) |
| self.assertEqual(wrapper.__name__, 'f') |
| self.assertEqual(wrapper.__qualname__, f.__qualname__) |
| self.assertEqual(wrapper.attr, 'This is also a test') |
| self.assertEqual(wrapper.__annotations__['a'], 'This is a new annotation') |
| self.assertNotIn('b', wrapper.__annotations__) |
| |
| @unittest.skipIf(sys.flags.optimize >= 2, |
| "Docstrings are omitted with -O2 and above") |
| def test_default_update_doc(self): |
| wrapper, f = self._default_update() |
| self.assertEqual(wrapper.__doc__, 'This is a test') |
| |
| def test_no_update(self): |
| def f(): |
| """This is a test""" |
| pass |
| f.attr = 'This is also a test' |
| def wrapper(): |
| pass |
| functools.update_wrapper(wrapper, f, (), ()) |
| self.check_wrapper(wrapper, f, (), ()) |
| self.assertEqual(wrapper.__name__, 'wrapper') |
| self.assertNotEqual(wrapper.__qualname__, f.__qualname__) |
| self.assertEqual(wrapper.__doc__, None) |
| self.assertEqual(wrapper.__annotations__, {}) |
| self.assertFalse(hasattr(wrapper, 'attr')) |
| |
| def test_selective_update(self): |
| def f(): |
| pass |
| f.attr = 'This is a different test' |
| f.dict_attr = dict(a=1, b=2, c=3) |
| def wrapper(): |
| pass |
| wrapper.dict_attr = {} |
| assign = ('attr',) |
| update = ('dict_attr',) |
| functools.update_wrapper(wrapper, f, assign, update) |
| self.check_wrapper(wrapper, f, assign, update) |
| self.assertEqual(wrapper.__name__, 'wrapper') |
| self.assertNotEqual(wrapper.__qualname__, f.__qualname__) |
| self.assertEqual(wrapper.__doc__, None) |
| self.assertEqual(wrapper.attr, 'This is a different test') |
| self.assertEqual(wrapper.dict_attr, f.dict_attr) |
| |
| def test_missing_attributes(self): |
| def f(): |
| pass |
| def wrapper(): |
| pass |
| wrapper.dict_attr = {} |
| assign = ('attr',) |
| update = ('dict_attr',) |
| # Missing attributes on wrapped object are ignored |
| functools.update_wrapper(wrapper, f, assign, update) |
| self.assertNotIn('attr', wrapper.__dict__) |
| self.assertEqual(wrapper.dict_attr, {}) |
| # Wrapper must have expected attributes for updating |
| del wrapper.dict_attr |
| with self.assertRaises(AttributeError): |
| functools.update_wrapper(wrapper, f, assign, update) |
| wrapper.dict_attr = 1 |
| with self.assertRaises(AttributeError): |
| functools.update_wrapper(wrapper, f, assign, update) |
| |
| @unittest.skipIf(sys.flags.optimize >= 2, |
| "Docstrings are omitted with -O2 and above") |
| def test_builtin_update(self): |
| # Test for bug #1576241 |
| def wrapper(): |
| pass |
| functools.update_wrapper(wrapper, max) |
| self.assertEqual(wrapper.__name__, 'max') |
| self.assertTrue(wrapper.__doc__.startswith('max(')) |
| self.assertEqual(wrapper.__annotations__, {}) |
| |
| class TestWraps(TestUpdateWrapper): |
| |
| def _default_update(self): |
| def f(): |
| """This is a test""" |
| pass |
| f.attr = 'This is also a test' |
| @functools.wraps(f) |
| def wrapper(): |
| pass |
| self.check_wrapper(wrapper, f) |
| return wrapper, f |
| |
| def test_default_update(self): |
| wrapper, f = self._default_update() |
| self.assertEqual(wrapper.__name__, 'f') |
| self.assertEqual(wrapper.__qualname__, f.__qualname__) |
| self.assertEqual(wrapper.attr, 'This is also a test') |
| |
| @unittest.skipIf(not sys.flags.optimize <= 1, |
| "Docstrings are omitted with -O2 and above") |
| def test_default_update_doc(self): |
| wrapper, _ = self._default_update() |
| self.assertEqual(wrapper.__doc__, 'This is a test') |
| |
| def test_no_update(self): |
| def f(): |
| """This is a test""" |
| pass |
| f.attr = 'This is also a test' |
| @functools.wraps(f, (), ()) |
| def wrapper(): |
| pass |
| self.check_wrapper(wrapper, f, (), ()) |
| self.assertEqual(wrapper.__name__, 'wrapper') |
| self.assertNotEqual(wrapper.__qualname__, f.__qualname__) |
| self.assertEqual(wrapper.__doc__, None) |
| self.assertFalse(hasattr(wrapper, 'attr')) |
| |
| def test_selective_update(self): |
| def f(): |
| pass |
| f.attr = 'This is a different test' |
| f.dict_attr = dict(a=1, b=2, c=3) |
| def add_dict_attr(f): |
| f.dict_attr = {} |
| return f |
| assign = ('attr',) |
| update = ('dict_attr',) |
| @functools.wraps(f, assign, update) |
| @add_dict_attr |
| def wrapper(): |
| pass |
| self.check_wrapper(wrapper, f, assign, update) |
| self.assertEqual(wrapper.__name__, 'wrapper') |
| self.assertNotEqual(wrapper.__qualname__, f.__qualname__) |
| self.assertEqual(wrapper.__doc__, None) |
| self.assertEqual(wrapper.attr, 'This is a different test') |
| self.assertEqual(wrapper.dict_attr, f.dict_attr) |
| |
| class TestReduce(unittest.TestCase): |
| func = functools.reduce |
| |
| def test_reduce(self): |
| class Squares: |
| def __init__(self, max): |
| self.max = max |
| self.sofar = [] |
| |
| def __len__(self): |
| return len(self.sofar) |
| |
| def __getitem__(self, i): |
| if not 0 <= i < self.max: raise IndexError |
| n = len(self.sofar) |
| while n <= i: |
| self.sofar.append(n*n) |
| n += 1 |
| return self.sofar[i] |
| def add(x, y): |
| return x + y |
| self.assertEqual(self.func(add, ['a', 'b', 'c'], ''), 'abc') |
| self.assertEqual( |
| self.func(add, [['a', 'c'], [], ['d', 'w']], []), |
| ['a','c','d','w'] |
| ) |
| self.assertEqual(self.func(lambda x, y: x*y, range(2,8), 1), 5040) |
| self.assertEqual( |
| self.func(lambda x, y: x*y, range(2,21), 1), |
| 2432902008176640000 |
| ) |
| self.assertEqual(self.func(add, Squares(10)), 285) |
| self.assertEqual(self.func(add, Squares(10), 0), 285) |
| self.assertEqual(self.func(add, Squares(0), 0), 0) |
| self.assertRaises(TypeError, self.func) |
| self.assertRaises(TypeError, self.func, 42, 42) |
| self.assertRaises(TypeError, self.func, 42, 42, 42) |
| self.assertEqual(self.func(42, "1"), "1") # func is never called with one item |
| self.assertEqual(self.func(42, "", "1"), "1") # func is never called with one item |
| self.assertRaises(TypeError, self.func, 42, (42, 42)) |
| self.assertRaises(TypeError, self.func, add, []) # arg 2 must not be empty sequence with no initial value |
| self.assertRaises(TypeError, self.func, add, "") |
| self.assertRaises(TypeError, self.func, add, ()) |
| self.assertRaises(TypeError, self.func, add, object()) |
| |
| class TestFailingIter: |
| def __iter__(self): |
| raise RuntimeError |
| self.assertRaises(RuntimeError, self.func, add, TestFailingIter()) |
| |
| self.assertEqual(self.func(add, [], None), None) |
| self.assertEqual(self.func(add, [], 42), 42) |
| |
| class BadSeq: |
| def __getitem__(self, index): |
| raise ValueError |
| self.assertRaises(ValueError, self.func, 42, BadSeq()) |
| |
| # Test reduce()'s use of iterators. |
| def test_iterator_usage(self): |
| class SequenceClass: |
| def __init__(self, n): |
| self.n = n |
| def __getitem__(self, i): |
| if 0 <= i < self.n: |
| return i |
| else: |
| raise IndexError |
| |
| from operator import add |
| self.assertEqual(self.func(add, SequenceClass(5)), 10) |
| self.assertEqual(self.func(add, SequenceClass(5), 42), 52) |
| self.assertRaises(TypeError, self.func, add, SequenceClass(0)) |
| self.assertEqual(self.func(add, SequenceClass(0), 42), 42) |
| self.assertEqual(self.func(add, SequenceClass(1)), 0) |
| self.assertEqual(self.func(add, SequenceClass(1), 42), 42) |
| |
| d = {"one": 1, "two": 2, "three": 3} |
| self.assertEqual(self.func(add, d), "".join(d.keys())) |
| |
| class TestCmpToKey(unittest.TestCase): |
| |
| def test_cmp_to_key(self): |
| def cmp1(x, y): |
| return (x > y) - (x < y) |
| key = functools.cmp_to_key(cmp1) |
| self.assertEqual(key(3), key(3)) |
| self.assertGreater(key(3), key(1)) |
| def cmp2(x, y): |
| return int(x) - int(y) |
| key = functools.cmp_to_key(cmp2) |
| self.assertEqual(key(4.0), key('4')) |
| self.assertLess(key(2), key('35')) |
| |
| def test_cmp_to_key_arguments(self): |
| def cmp1(x, y): |
| return (x > y) - (x < y) |
| key = functools.cmp_to_key(mycmp=cmp1) |
| self.assertEqual(key(obj=3), key(obj=3)) |
| self.assertGreater(key(obj=3), key(obj=1)) |
| with self.assertRaises((TypeError, AttributeError)): |
| key(3) > 1 # rhs is not a K object |
| with self.assertRaises((TypeError, AttributeError)): |
| 1 < key(3) # lhs is not a K object |
| with self.assertRaises(TypeError): |
| key = functools.cmp_to_key() # too few args |
| with self.assertRaises(TypeError): |
| key = functools.cmp_to_key(cmp1, None) # too many args |
| key = functools.cmp_to_key(cmp1) |
| with self.assertRaises(TypeError): |
| key() # too few args |
| with self.assertRaises(TypeError): |
| key(None, None) # too many args |
| |
| def test_bad_cmp(self): |
| def cmp1(x, y): |
| raise ZeroDivisionError |
| key = functools.cmp_to_key(cmp1) |
| with self.assertRaises(ZeroDivisionError): |
| key(3) > key(1) |
| |
| class BadCmp: |
| def __lt__(self, other): |
| raise ZeroDivisionError |
| def cmp1(x, y): |
| return BadCmp() |
| with self.assertRaises(ZeroDivisionError): |
| key(3) > key(1) |
| |
| def test_obj_field(self): |
| def cmp1(x, y): |
| return (x > y) - (x < y) |
| key = functools.cmp_to_key(mycmp=cmp1) |
| self.assertEqual(key(50).obj, 50) |
| |
| def test_sort_int(self): |
| def mycmp(x, y): |
| return y - x |
| self.assertEqual(sorted(range(5), key=functools.cmp_to_key(mycmp)), |
| [4, 3, 2, 1, 0]) |
| |
| def test_sort_int_str(self): |
| def mycmp(x, y): |
| x, y = int(x), int(y) |
| return (x > y) - (x < y) |
| values = [5, '3', 7, 2, '0', '1', 4, '10', 1] |
| values = sorted(values, key=functools.cmp_to_key(mycmp)) |
| self.assertEqual([int(value) for value in values], |
| [0, 1, 1, 2, 3, 4, 5, 7, 10]) |
| |
| def test_hash(self): |
| def mycmp(x, y): |
| return y - x |
| key = functools.cmp_to_key(mycmp) |
| k = key(10) |
| self.assertRaises(TypeError, hash, k) |
| self.assertNotIsInstance(k, collections.Hashable) |
| |
| class TestTotalOrdering(unittest.TestCase): |
| |
| def test_total_ordering_lt(self): |
| @functools.total_ordering |
| class A: |
| def __init__(self, value): |
| self.value = value |
| def __lt__(self, other): |
| return self.value < other.value |
| def __eq__(self, other): |
| return self.value == other.value |
| self.assertTrue(A(1) < A(2)) |
| self.assertTrue(A(2) > A(1)) |
| self.assertTrue(A(1) <= A(2)) |
| self.assertTrue(A(2) >= A(1)) |
| self.assertTrue(A(2) <= A(2)) |
| self.assertTrue(A(2) >= A(2)) |
| |
| def test_total_ordering_le(self): |
| @functools.total_ordering |
| class A: |
| def __init__(self, value): |
| self.value = value |
| def __le__(self, other): |
| return self.value <= other.value |
| def __eq__(self, other): |
| return self.value == other.value |
| self.assertTrue(A(1) < A(2)) |
| self.assertTrue(A(2) > A(1)) |
| self.assertTrue(A(1) <= A(2)) |
| self.assertTrue(A(2) >= A(1)) |
| self.assertTrue(A(2) <= A(2)) |
| self.assertTrue(A(2) >= A(2)) |
| |
| def test_total_ordering_gt(self): |
| @functools.total_ordering |
| class A: |
| def __init__(self, value): |
| self.value = value |
| def __gt__(self, other): |
| return self.value > other.value |
| def __eq__(self, other): |
| return self.value == other.value |
| self.assertTrue(A(1) < A(2)) |
| self.assertTrue(A(2) > A(1)) |
| self.assertTrue(A(1) <= A(2)) |
| self.assertTrue(A(2) >= A(1)) |
| self.assertTrue(A(2) <= A(2)) |
| self.assertTrue(A(2) >= A(2)) |
| |
| def test_total_ordering_ge(self): |
| @functools.total_ordering |
| class A: |
| def __init__(self, value): |
| self.value = value |
| def __ge__(self, other): |
| return self.value >= other.value |
| def __eq__(self, other): |
| return self.value == other.value |
| self.assertTrue(A(1) < A(2)) |
| self.assertTrue(A(2) > A(1)) |
| self.assertTrue(A(1) <= A(2)) |
| self.assertTrue(A(2) >= A(1)) |
| self.assertTrue(A(2) <= A(2)) |
| self.assertTrue(A(2) >= A(2)) |
| |
| def test_total_ordering_no_overwrite(self): |
| # new methods should not overwrite existing |
| @functools.total_ordering |
| class A(int): |
| pass |
| self.assertTrue(A(1) < A(2)) |
| self.assertTrue(A(2) > A(1)) |
| self.assertTrue(A(1) <= A(2)) |
| self.assertTrue(A(2) >= A(1)) |
| self.assertTrue(A(2) <= A(2)) |
| self.assertTrue(A(2) >= A(2)) |
| |
| def test_no_operations_defined(self): |
| with self.assertRaises(ValueError): |
| @functools.total_ordering |
| class A: |
| pass |
| |
| def test_bug_10042(self): |
| @functools.total_ordering |
| class TestTO: |
| def __init__(self, value): |
| self.value = value |
| def __eq__(self, other): |
| if isinstance(other, TestTO): |
| return self.value == other.value |
| return False |
| def __lt__(self, other): |
| if isinstance(other, TestTO): |
| return self.value < other.value |
| raise TypeError |
| with self.assertRaises(TypeError): |
| TestTO(8) <= () |
| |
| class TestLRU(unittest.TestCase): |
| |
| def test_lru(self): |
| def orig(x, y): |
| return 3*x+y |
| f = functools.lru_cache(maxsize=20)(orig) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(maxsize, 20) |
| self.assertEqual(currsize, 0) |
| self.assertEqual(hits, 0) |
| self.assertEqual(misses, 0) |
| |
| domain = range(5) |
| for i in range(1000): |
| x, y = choice(domain), choice(domain) |
| actual = f(x, y) |
| expected = orig(x, y) |
| self.assertEqual(actual, expected) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertTrue(hits > misses) |
| self.assertEqual(hits + misses, 1000) |
| self.assertEqual(currsize, 20) |
| |
| f.cache_clear() # test clearing |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(hits, 0) |
| self.assertEqual(misses, 0) |
| self.assertEqual(currsize, 0) |
| f(x, y) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(hits, 0) |
| self.assertEqual(misses, 1) |
| self.assertEqual(currsize, 1) |
| |
| # Test bypassing the cache |
| self.assertIs(f.__wrapped__, orig) |
| f.__wrapped__(x, y) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(hits, 0) |
| self.assertEqual(misses, 1) |
| self.assertEqual(currsize, 1) |
| |
| # test size zero (which means "never-cache") |
| @functools.lru_cache(0) |
| def f(): |
| nonlocal f_cnt |
| f_cnt += 1 |
| return 20 |
| self.assertEqual(f.cache_info().maxsize, 0) |
| f_cnt = 0 |
| for i in range(5): |
| self.assertEqual(f(), 20) |
| self.assertEqual(f_cnt, 5) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(hits, 0) |
| self.assertEqual(misses, 5) |
| self.assertEqual(currsize, 0) |
| |
| # test size one |
| @functools.lru_cache(1) |
| def f(): |
| nonlocal f_cnt |
| f_cnt += 1 |
| return 20 |
| self.assertEqual(f.cache_info().maxsize, 1) |
| f_cnt = 0 |
| for i in range(5): |
| self.assertEqual(f(), 20) |
| self.assertEqual(f_cnt, 1) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(hits, 4) |
| self.assertEqual(misses, 1) |
| self.assertEqual(currsize, 1) |
| |
| # test size two |
| @functools.lru_cache(2) |
| def f(x): |
| nonlocal f_cnt |
| f_cnt += 1 |
| return x*10 |
| self.assertEqual(f.cache_info().maxsize, 2) |
| f_cnt = 0 |
| for x in 7, 9, 7, 9, 7, 9, 8, 8, 8, 9, 9, 9, 8, 8, 8, 7: |
| # * * * * |
| self.assertEqual(f(x), x*10) |
| self.assertEqual(f_cnt, 4) |
| hits, misses, maxsize, currsize = f.cache_info() |
| self.assertEqual(hits, 12) |
| self.assertEqual(misses, 4) |
| self.assertEqual(currsize, 2) |
| |
| def test_lru_with_maxsize_none(self): |
| @functools.lru_cache(maxsize=None) |
| def fib(n): |
| if n < 2: |
| return n |
| return fib(n-1) + fib(n-2) |
| self.assertEqual([fib(n) for n in range(16)], |
| [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]) |
| self.assertEqual(fib.cache_info(), |
| functools._CacheInfo(hits=28, misses=16, maxsize=None, currsize=16)) |
| fib.cache_clear() |
| self.assertEqual(fib.cache_info(), |
| functools._CacheInfo(hits=0, misses=0, maxsize=None, currsize=0)) |
| |
| def test_lru_with_exceptions(self): |
| # Verify that user_function exceptions get passed through without |
| # creating a hard-to-read chained exception. |
| # http://bugs.python.org/issue13177 |
| for maxsize in (None, 100): |
| @functools.lru_cache(maxsize) |
| def func(i): |
| return 'abc'[i] |
| self.assertEqual(func(0), 'a') |
| with self.assertRaises(IndexError) as cm: |
| func(15) |
| self.assertIsNone(cm.exception.__context__) |
| # Verify that the previous exception did not result in a cached entry |
| with self.assertRaises(IndexError): |
| func(15) |
| |
| def test_lru_with_types(self): |
| for maxsize in (None, 100): |
| @functools.lru_cache(maxsize=maxsize, typed=True) |
| def square(x): |
| return x * x |
| self.assertEqual(square(3), 9) |
| self.assertEqual(type(square(3)), type(9)) |
| self.assertEqual(square(3.0), 9.0) |
| self.assertEqual(type(square(3.0)), type(9.0)) |
| self.assertEqual(square(x=3), 9) |
| self.assertEqual(type(square(x=3)), type(9)) |
| self.assertEqual(square(x=3.0), 9.0) |
| self.assertEqual(type(square(x=3.0)), type(9.0)) |
| self.assertEqual(square.cache_info().hits, 4) |
| self.assertEqual(square.cache_info().misses, 4) |
| |
| def test_main(verbose=None): |
| test_classes = ( |
| TestPartial, |
| TestPartialSubclass, |
| TestPythonPartial, |
| TestUpdateWrapper, |
| TestTotalOrdering, |
| TestCmpToKey, |
| TestWraps, |
| TestReduce, |
| TestLRU, |
| ) |
| support.run_unittest(*test_classes) |
| |
| # verify reference counting |
| if verbose and hasattr(sys, "gettotalrefcount"): |
| import gc |
| counts = [None] * 5 |
| for i in range(len(counts)): |
| support.run_unittest(*test_classes) |
| gc.collect() |
| counts[i] = sys.gettotalrefcount() |
| print(counts) |
| |
| if __name__ == '__main__': |
| test_main(verbose=True) |