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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I find Raymond's perspective persuasive in this case. Feel free to post either the original idea or my later variant as an ASPN cookbook recipe. (you could actually combine the two, and use NullContext as an implementation detail of an optional_cm() function)

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resolution:  -> rejected
status: open -> closed

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<http://bugs.python.org/issue10049>
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