[issue7787] Add an argument to test_support.open_urlresource to invalidate the cache

[Florent Xicluna]

Florent Xicluna <laxyf at yahoo.fr> added the comment:

The check argument is any function which receives an open file and return a boolean.

For example:
 - verify the version number on the first line (test_normalization)
 - calculate the MD5

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keywords: +patch
nosy: +r.david.murray
stage:  -> patch review
Added file: http://bugs.python.org/file16016/issue7787_urlresource.diff

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