219 lines
7.6 KiB
Python
219 lines
7.6 KiB
Python
# Python test set -- built-in functions
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import test.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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import warnings
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warnings.filterwarnings("ignore", "integer argument expected",
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DeprecationWarning, "unittest")
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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 XrangeTest(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.izip_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 assert_xranges_equivalent(self, x, y):
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# Check that two xrange objects are equivalent, in the sense of the
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# associated sequences being the same. We want to use this for large
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# xrange objects, so instead of converting to lists and comparing
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# directly we do a number of indirect checks.
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if len(x) != len(y):
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self.fail('{} and {} have different '
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'lengths: {} and {} '.format(x, y, len(x), len(y)))
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if len(x) >= 1:
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if x[0] != y[0]:
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self.fail('{} and {} have different initial '
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'elements: {} and {} '.format(x, y, x[0], y[0]))
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if x[-1] != y[-1]:
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self.fail('{} and {} have different final '
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'elements: {} and {} '.format(x, y, x[-1], y[-1]))
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if len(x) >= 2:
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x_step = x[1] - x[0]
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y_step = y[1] - y[0]
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if x_step != y_step:
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self.fail('{} and {} have different step: '
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'{} and {} '.format(x, y, x_step, y_step))
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def test_xrange(self):
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self.assertEqual(list(xrange(3)), [0, 1, 2])
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self.assertEqual(list(xrange(1, 5)), [1, 2, 3, 4])
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self.assertEqual(list(xrange(0)), [])
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self.assertEqual(list(xrange(-3)), [])
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self.assertEqual(list(xrange(1, 10, 3)), [1, 4, 7])
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self.assertEqual(list(xrange(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(xrange(a, a+2)), [a, a+1])
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self.assertEqual(list(xrange(a+2, a, -1L)), [a+2, a+1])
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self.assertEqual(list(xrange(a+4, a, -2)), [a+4, a+2])
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seq = list(xrange(a, b, c))
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self.assertIn(a, seq)
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self.assertNotIn(b, seq)
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self.assertEqual(len(seq), 2)
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seq = list(xrange(b, a, -c))
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self.assertIn(b, seq)
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self.assertNotIn(a, seq)
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self.assertEqual(len(seq), 2)
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seq = list(xrange(-a, -b, -c))
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self.assertIn(-a, seq)
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self.assertNotIn(-b, seq)
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self.assertEqual(len(seq), 2)
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self.assertRaises(TypeError, xrange)
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self.assertRaises(TypeError, xrange, 1, 2, 3, 4)
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self.assertRaises(ValueError, xrange, 1, 2, 0)
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self.assertRaises(OverflowError, xrange, 10**100, 10**101, 10**101)
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self.assertRaises(TypeError, xrange, 0, "spam")
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self.assertRaises(TypeError, xrange, 0, 42, "spam")
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self.assertEqual(len(xrange(0, sys.maxint, sys.maxint-1)), 2)
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self.assertRaises(OverflowError, xrange, -sys.maxint, sys.maxint)
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self.assertRaises(OverflowError, xrange, 0, 2*sys.maxint)
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r = xrange(-sys.maxint, sys.maxint, 2)
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self.assertEqual(len(r), sys.maxint)
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self.assertRaises(OverflowError, xrange, -sys.maxint-1, sys.maxint, 2)
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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 = xrange(*t)
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self.assertEqual(list(pickle.loads(pickle.dumps(r, proto))),
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list(r))
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M = min(sys.maxint, sys.maxsize)
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large_testcases = testcases + [
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(0, M, 1),
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(M, 0, -1),
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(0, M, M - 1),
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(M // 2, M, 1),
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(0, -M, -1),
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(0, -M, 1 - M),
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(-M, M, 2),
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(-M, M, 1024),
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(-M, M, 10585),
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(M, -M, -2),
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(M, -M, -1024),
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(M, -M, -10585),
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]
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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for t in large_testcases:
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r = xrange(*t)
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r_out = pickle.loads(pickle.dumps(r, proto))
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self.assert_xranges_equivalent(r_out, r)
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def test_repr(self):
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# Check that repr of an xrange is a valid representation
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# of that xrange.
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# Valid xranges have at most min(sys.maxint, sys.maxsize) elements.
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M = min(sys.maxint, sys.maxsize)
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testcases = [
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(13,),
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(0, 11),
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(-22, 10),
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(20, 3, -1),
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(13, 21, 3),
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(-2, 2, 2),
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(0, M, 1),
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(M, 0, -1),
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(0, M, M - 1),
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(M // 2, M, 1),
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(0, -M, -1),
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(0, -M, 1 - M),
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(-M, M, 2),
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(-M, M, 1024),
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(-M, M, 10585),
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(M, -M, -2),
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(M, -M, -1024),
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(M, -M, -10585),
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]
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for t in testcases:
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r = xrange(*t)
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r_out = eval(repr(r))
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self.assert_xranges_equivalent(r, r_out)
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def test_range_iterators(self):
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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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try:
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iter1 = xrange(start, end, step)
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except OverflowError:
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pass
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else:
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iter2 = pyrange(start, end, step)
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test_id = "xrange({}, {}, {})".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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try:
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iter1 = reversed(xrange(start, end, step))
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except OverflowError:
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pass
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else:
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iter2 = pyrange_reversed(start, end, step)
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test_id = "reversed(xrange({}, {}, {}))".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.test_support.run_unittest(XrangeTest)
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if __name__ == "__main__":
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test_main()
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