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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

+1
I have not yet had occasion to use 'with' yet, but in reading the Unicode HOWTO diff, I noticed that I liked replacing 'open,read,close' with 'with open, read' just for reading purposes since it turns 3 steps into 1 compound transaction.

Perhaps something should also be added to the doc style guide (along with using 'attributes' instead of 'members').

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nosy: +terry.reedy

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