Brett Cannon added the comment:
When I have a chance I'll do up a new patch where the definition of
typing.ContextManager is guarded, add a What's New entry, and commit it. My
planned guard will be:
if hasattr(contextlib, 'AbstractContextManager'):
class ContextManager(...): ...
__all__.append('ContextManager')
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25609>
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