[issue10461] Use with statement throughout the docs

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Do not change the examples in collections.rst.
That would interfere with the clarify of what
is being demonstrated.  For example, the hamlet.txt
example is not about file reading, it about 
counting words.

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nosy: +rhettinger

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