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bpo-30266: support "= None" pattern in AbstractContextManager (GH-1448) (GH-2054)

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contextlib.AbstractContextManager now supports anti-registration
by setting __enter__ = None or __exit__ = None, following the pattern
introduced in bpo-25958..
(cherry picked from commit 57161aac5e)
This commit is contained in:
Mariatta 2017-06-09 20:36:28 -07:00 • committed by GitHub
parent e380c19b7e
commit 753422f6e3
3 changed files with 16 additions and 3 deletions
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10
Lib/test/test_contextlib.py
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@ -44,6 +44,16 @@ class TestAbstractContextManager(unittest.TestCase):
self.assertTrue(issubclass(DefaultEnter, AbstractContextManager))
class NoEnter(ManagerFromScratch):
__enter__ = None
self.assertFalse(issubclass(NoEnter, AbstractContextManager))
class NoExit(ManagerFromScratch):
__exit__ = None
self.assertFalse(issubclass(NoExit, AbstractContextManager))
class ContextManagerTestCase(unittest.TestCase):