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