Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

In the new patch, issue9104.diff, I factored out import machinery into 
test.support.import_module_implementations and added it to a a couple of other 
test modules.  I did not attempt to improve all pickle tests.

The availability of import_module_implementations raises an interesting 
question of what to do in cases like heapq where one can potentially test 4 
combinations of heapq/_heapq with pickle/_pickle.  Given that currently 
pickling of heapq objects is either not supported or not tested, we don't need 
to worry about it, but as parallel optimized/pure python module implementations 
proliferate, we may face exponential explosion of potential test cases.

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Added file: http://bugs.python.org/file17793/issue9104.diff

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