mirror of https://github.com/python/cpython
147 lines
5.4 KiB
Python
147 lines
5.4 KiB
Python
# Python test set -- built-in functions
|
|
|
|
import test.support, unittest
|
|
import sys
|
|
import pickle
|
|
import itertools
|
|
|
|
import warnings
|
|
warnings.filterwarnings("ignore", "integer argument expected",
|
|
DeprecationWarning, "unittest")
|
|
|
|
# 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.assertTrue(a in seq)
|
|
self.assertTrue(b not in seq)
|
|
self.assertEqual(len(seq), 2)
|
|
|
|
seq = list(range(b, a, -c))
|
|
self.assertTrue(b in seq)
|
|
self.assertTrue(a not in seq)
|
|
self.assertEqual(len(seq), 2)
|
|
|
|
seq = list(range(-a, -b, -c))
|
|
self.assertTrue(-a in seq)
|
|
self.assertTrue(-b not in 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.assertEqual(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_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()
|