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Showing content from https://mail.python.org/pipermail/python-dev/2013-October/129681.html below:

[Python-Dev] On suppress()'s trail blazing (was Re: cpython: Rename contextlib.ignored() to contextlib.ignore())

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Guido van Rossum wrote:
> yielding inside "with open(file) as f" 
> seems fine, but yielding inside "with lock" is problematic, since the 
> other side might try to acquire the same lock, and deadlock.

So maybe the documentation of a context manager should
include whether it's safe to yield inside the block.

-- 
Greg

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