[issue10049] Add a "no-op" (null) context manager to contextlib

[Hrvoje Nikšić]

Hrvoje Nikšić <hniksic at gmail.com> added the comment:

Here is a more complete patch that includes input from Nick, as well as the patch to test_contextlib.py and the documentation.

For now I've retained the function-returning-singleton approach for consistency and future extensibility.

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keywords: +patch
Added file: http://bugs.python.org/file19176/nullcontext.patch

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