[issue7944] Use the 'with' statement in conjunction with 'open' throughout test modules

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

Does anyone prefer if this should be done on a patch-per-module basis, or just throw together one huge change? 

Also, I've found a few places where context managers aren't supported where they probably should be, so I'll spin off separate issues for those.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7944>
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