[docs] [issue10461] Use with statement throughout the docs

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

with also replaces open-try-do stuff-finally-close, the correct idiom for ensuring file handles are always closes in all VMs.

I don’t think the doc style guide is the right place, since this is a code issue.  with is advertised in http://docs.python.org/dev/tutorial/inputoutput#methods-of-file-objects and http://docs.python.org/dev/howto/doanddont#exceptions ; http://docs.python.org/dev/library/functions#open says nothing about closing, and http://docs.python.org/dev/library/io tells about the with statement without recommending it strongly.

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<http://bugs.python.org/issue10461>
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