[issue4565] Rewrite the IO stack in C

[Raymond Hettinger]

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

[Benjamin Peterson]
> I think we should just drop the Python implementations. There's no point
> in trying to keep two implementations around.

I disagree.  I've found great value in keeping a pure python version
around for things I've converted to C.   The former serves as
documentation, as a tool for other implementations (like PyPy
IronPython, and Jython), and as a precise spec.  The latter case
is especially valuable (otherwise, the spec becomes whatever
CPython happens to do). 

Also, I've found that once the two are in-sync, keeping it that way
isn't hard.  And, there effort for keeping them in-sync is a good
way to find bugs.

In the heapqmodule, we do a little magic in the test suite to
make sure the tests are run against both.  It's not hard.


Raymond

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nosy: +rhettinger

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