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Implement and apply PEP 322, reverse iteration

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This commit is contained in:
Raymond Hettinger 2003-11-06 14:06:48 +00:00
parent f607fc5395
commit 85c20a41df
12 changed files with 198 additions and 9 deletions
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20
Lib/test/test_enumerate.py
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@ -124,9 +124,27 @@ class TestBig(EnumerateTestCase):
seq = range(10,20000,2)
res = zip(range(20000), seq)
class TestReversed(unittest.TestCase):
def test_simple(self):
class A:
def __getitem__(self, i):
if i < 5:
return str(i)
raise StopIteration
def __len__(self):
return 5
for data in 'abc', range(5), tuple(enumerate('abc')), A(), xrange(1,17,5):
self.assertEqual(list(data)[::-1], list(reversed(data)))
self.assertRaises(TypeError, reversed, {})
def test_xrange_optimization(self):
x = xrange(1)
self.assertEqual(type(reversed(x)), type(iter(x)))
def test_main(verbose=None):
testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig)
testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig,
TestReversed)
test_support.run_unittest(*testclasses)
# verify reference counting