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

[Éric Araujo]

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

Thanks for the catch!  I was so used to the idiom where opening the file doesn’t fail but you protect the read or write that I didn’t think about the issue here.

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stage: commit review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10461>
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