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Code Issues Releases Wiki Activity

Backport 2eb8789e30e7.

This commit is contained in:
Alex Gaynor 2011-07-17 16:44:31 -07:00
parent 1c0ebc0fa5
commit 9737648c74
1 changed files with 15 additions and 6 deletions
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21
Lib/test/test_itertools.py
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@ -137,7 +137,8 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(result, list(combinations2(values, r))) # matches second pure python version
self.assertEqual(result, list(combinations3(values, r))) # matches second pure python version
# Test implementation detail: tuple re-use
@test_support.impl_detail("tuple reuse is specific to CPython")
def test_combinations_tuple_reuse(self):
self.assertEqual(len(set(map(id, combinations('abcde', 3)))), 1)
self.assertNotEqual(len(set(map(id, list(combinations('abcde', 3))))), 1)
@ -207,7 +208,9 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(result, list(cwr1(values, r))) # matches first pure python version
self.assertEqual(result, list(cwr2(values, r))) # matches second pure python version
# Test implementation detail: tuple re-use
@test_support.impl_detail("tuple reuse is specific to CPython")
def test_combinations_with_replacement_tuple_reuse(self):
cwr = combinations_with_replacement
self.assertEqual(len(set(map(id, cwr('abcde', 3)))), 1)
self.assertNotEqual(len(set(map(id, list(cwr('abcde', 3))))), 1)
@ -271,7 +274,8 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(result, list(permutations(values, None))) # test r as None
self.assertEqual(result, list(permutations(values))) # test default r
# Test implementation detail: tuple re-use
@test_support.impl_detail("tuple resuse is CPython specific")
def test_permutations_tuple_reuse(self):
self.assertEqual(len(set(map(id, permutations('abcde', 3)))), 1)
self.assertNotEqual(len(set(map(id, list(permutations('abcde', 3))))), 1)
@ -526,11 +530,13 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(list(izip()), zip())
self.assertRaises(TypeError, izip, 3)
self.assertRaises(TypeError, izip, range(3), 3)
# Check tuple re-use (implementation detail)
self.assertEqual([tuple(list(pair)) for pair in izip('abc', 'def')],
zip('abc', 'def'))
self.assertEqual([pair for pair in izip('abc', 'def')],
zip('abc', 'def'))
@test_support.impl_detail("tuple reuse is specific to CPython")
def test_izip_tuple_resuse(self):
ids = map(id, izip('abc', 'def'))
self.assertEqual(min(ids), max(ids))
ids = map(id, list(izip('abc', 'def')))
@ -575,11 +581,13 @@ class TestBasicOps(unittest.TestCase):
else:
self.fail('Did not raise Type in: ' + stmt)
# Check tuple re-use (implementation detail)
self.assertEqual([tuple(list(pair)) for pair in izip_longest('abc', 'def')],
zip('abc', 'def'))
self.assertEqual([pair for pair in izip_longest('abc', 'def')],
zip('abc', 'def'))
@test_support.impl_detail("tuple reuse is specific to CPython")
def test_izip_longest_tuple_reuse(self):
ids = map(id, izip_longest('abc', 'def'))
self.assertEqual(min(ids), max(ids))
ids = map(id, list(izip_longest('abc', 'def')))
@ -683,7 +691,8 @@ class TestBasicOps(unittest.TestCase):
args = map(iter, args)
self.assertEqual(len(list(product(*args))), expected_len)
# Test implementation detail: tuple re-use
@test_support.impl_detail("tuple reuse is specific to CPython")
def test_product_tuple_reuse(self):
self.assertEqual(len(set(map(id, product('abc', 'def')))), 1)
self.assertNotEqual(len(set(map(id, list(product('abc', 'def'))))), 1)