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Issue #23757: Only call the concrete list API for exact lists.

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This commit is contained in:
Raymond Hettinger 2015-05-17 14:45:58 -07:00
parent 6558190e52
commit 610a51f364
3 changed files with 16 additions and 1 deletions
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12
Lib/test/seq_tests.py
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@ -85,6 +85,14 @@ def itermulti(seqn):
'Test multiple tiers of iterators'
return chain(map(lambda x:x, iterfunc(IterGen(Sequence(seqn)))))
class LyingTuple(tuple):
def __iter__(self):
yield 1
class LyingList(list):
def __iter__(self):
yield 1
class CommonTest(unittest.TestCase):
# The type to be tested
type2test = None
@ -131,6 +139,10 @@ class CommonTest(unittest.TestCase):
self.assertRaises(TypeError, self.type2test, IterNoNext(s))
self.assertRaises(ZeroDivisionError, self.type2test, IterGenExc(s))
# Issue #23757
self.assertEqual(self.type2test(LyingTuple((2,))), self.type2test((1,)))
self.assertEqual(self.type2test(LyingList([2])), self.type2test([1]))
def test_truth(self):
self.assertFalse(self.type2test())
self.assertTrue(self.type2test([42]))