| # Python test set -- built-in functions |
| |
| import test.support, unittest |
| import sys |
| import pickle |
| import itertools |
| |
| # pure Python implementations (3 args only), for comparison |
| def pyrange(start, stop, step): |
| if (start - stop) // step < 0: |
| # replace stop with next element in the sequence of integers |
| # that are congruent to start modulo step. |
| stop += (start - stop) % step |
| while start != stop: |
| yield start |
| start += step |
| |
| def pyrange_reversed(start, stop, step): |
| stop += (start - stop) % step |
| return pyrange(stop - step, start - step, -step) |
| |
| |
| class RangeTest(unittest.TestCase): |
| def assert_iterators_equal(self, xs, ys, test_id, limit=None): |
| # check that an iterator xs matches the expected results ys, |
| # up to a given limit. |
| if limit is not None: |
| xs = itertools.islice(xs, limit) |
| ys = itertools.islice(ys, limit) |
| sentinel = object() |
| pairs = itertools.zip_longest(xs, ys, fillvalue=sentinel) |
| for i, (x, y) in enumerate(pairs): |
| if x == y: |
| continue |
| elif x == sentinel: |
| self.fail('{}: iterator ended unexpectedly ' |
| 'at position {}; expected {}'.format(test_id, i, y)) |
| elif y == sentinel: |
| self.fail('{}: unexpected excess element {} at ' |
| 'position {}'.format(test_id, x, i)) |
| else: |
| self.fail('{}: wrong element at position {};' |
| 'expected {}, got {}'.format(test_id, i, y, x)) |
| |
| def test_range(self): |
| self.assertEqual(list(range(3)), [0, 1, 2]) |
| self.assertEqual(list(range(1, 5)), [1, 2, 3, 4]) |
| self.assertEqual(list(range(0)), []) |
| self.assertEqual(list(range(-3)), []) |
| self.assertEqual(list(range(1, 10, 3)), [1, 4, 7]) |
| self.assertEqual(list(range(5, -5, -3)), [5, 2, -1, -4]) |
| |
| a = 10 |
| b = 100 |
| c = 50 |
| |
| self.assertEqual(list(range(a, a+2)), [a, a+1]) |
| self.assertEqual(list(range(a+2, a, -1)), [a+2, a+1]) |
| self.assertEqual(list(range(a+4, a, -2)), [a+4, a+2]) |
| |
| seq = list(range(a, b, c)) |
| self.assertIn(a, seq) |
| self.assertNotIn(b, seq) |
| self.assertEqual(len(seq), 2) |
| |
| seq = list(range(b, a, -c)) |
| self.assertIn(b, seq) |
| self.assertNotIn(a, seq) |
| self.assertEqual(len(seq), 2) |
| |
| seq = list(range(-a, -b, -c)) |
| self.assertIn(-a, seq) |
| self.assertNotIn(-b, seq) |
| self.assertEqual(len(seq), 2) |
| |
| self.assertRaises(TypeError, range) |
| self.assertRaises(TypeError, range, 1, 2, 3, 4) |
| self.assertRaises(ValueError, range, 1, 2, 0) |
| |
| self.assertRaises(TypeError, range, 0.0, 2, 1) |
| self.assertRaises(TypeError, range, 1, 2.0, 1) |
| self.assertRaises(TypeError, range, 1, 2, 1.0) |
| self.assertRaises(TypeError, range, 1e100, 1e101, 1e101) |
| |
| self.assertRaises(TypeError, range, 0, "spam") |
| self.assertRaises(TypeError, range, 0, 42, "spam") |
| |
| self.assertEqual(len(range(0, sys.maxsize, sys.maxsize-1)), 2) |
| |
| r = range(-sys.maxsize, sys.maxsize, 2) |
| self.assertEqual(len(r), sys.maxsize) |
| |
| def test_repr(self): |
| self.assertEqual(repr(range(1)), 'range(0, 1)') |
| self.assertEqual(repr(range(1, 2)), 'range(1, 2)') |
| self.assertEqual(repr(range(1, 2, 3)), 'range(1, 2, 3)') |
| |
| def test_pickling(self): |
| testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1), |
| (13, 21, 3), (-2, 2, 2)] |
| for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| for t in testcases: |
| r = range(*t) |
| self.assertEquals(list(pickle.loads(pickle.dumps(r, proto))), |
| list(r)) |
| |
| def test_odd_bug(self): |
| # This used to raise a "SystemError: NULL result without error" |
| # because the range validation step was eating the exception |
| # before NULL was returned. |
| with self.assertRaises(TypeError): |
| range([], 1, -1) |
| |
| def test_types(self): |
| # Non-integer objects *equal* to any of the range's items are supposed |
| # to be contained in the range. |
| self.assertIn(1.0, range(3)) |
| self.assertIn(True, range(3)) |
| self.assertIn(1+0j, range(3)) |
| |
| class C1: |
| def __eq__(self, other): return True |
| self.assertIn(C1(), range(3)) |
| |
| # Objects are never coerced into other types for comparison. |
| class C2: |
| def __int__(self): return 1 |
| def __index__(self): return 1 |
| self.assertNotIn(C2(), range(3)) |
| # ..except if explicitly told so. |
| self.assertIn(int(C2()), range(3)) |
| |
| # Check that the range.__contains__ optimization is only |
| # used for ints, not for instances of subclasses of int. |
| class C3(int): |
| def __eq__(self, other): return True |
| self.assertIn(C3(11), range(10)) |
| self.assertIn(C3(11), list(range(10))) |
| |
| def test_strided_limits(self): |
| r = range(0, 101, 2) |
| self.assertIn(0, r) |
| self.assertNotIn(1, r) |
| self.assertIn(2, r) |
| self.assertNotIn(99, r) |
| self.assertIn(100, r) |
| self.assertNotIn(101, r) |
| |
| r = range(0, -20, -1) |
| self.assertIn(0, r) |
| self.assertIn(-1, r) |
| self.assertIn(-19, r) |
| self.assertNotIn(-20, r) |
| |
| r = range(0, -20, -2) |
| self.assertIn(-18, r) |
| self.assertNotIn(-19, r) |
| self.assertNotIn(-20, r) |
| |
| def test_empty(self): |
| r = range(0) |
| self.assertNotIn(0, r) |
| self.assertNotIn(1, r) |
| |
| r = range(0, -10) |
| self.assertNotIn(0, r) |
| self.assertNotIn(-1, r) |
| self.assertNotIn(1, r) |
| |
| def test_range_iterators(self): |
| # exercise 'fast' iterators, that use a rangeiterobject internally. |
| # see issue 7298 |
| limits = [base + jiggle |
| for M in (2**32, 2**64) |
| for base in (-M, -M//2, 0, M//2, M) |
| for jiggle in (-2, -1, 0, 1, 2)] |
| test_ranges = [(start, end, step) |
| for start in limits |
| for end in limits |
| for step in (-2**63, -2**31, -2, -1, 1, 2)] |
| |
| for start, end, step in test_ranges: |
| iter1 = range(start, end, step) |
| iter2 = pyrange(start, end, step) |
| test_id = "range({}, {}, {})".format(start, end, step) |
| # check first 100 entries |
| self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
| |
| iter1 = reversed(range(start, end, step)) |
| iter2 = pyrange_reversed(start, end, step) |
| test_id = "reversed(range({}, {}, {}))".format(start, end, step) |
| self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
| |
| def test_main(): |
| test.support.run_unittest(RangeTest) |
| |
| if __name__ == "__main__": |
| test_main() |