[issue7989] Add pure Python implementation of datetime module to CPython

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

I would like to move this forward.  The PyPy implementation at

http://codespeak.net/pypy/dist/pypy/lib/datetime.py

claims to be based on the original CPython datetime implementation from the time when datetime was a python module.  I looked through the code and it seems to be very similar to datetime.c.  Some docstings and comments are literal copies.  I think it will not be hard to port that to 3.x.

I have a few questions, though.

1. I remember seeing python-dev discussion that concluded that the best way to distribute parallel C and Python implementations was to have module.py with the following:

# pure python implementation

def foo():
    pass

def bar():
    pass

# ..

try:
    from _module import *
except ImportError:
    pass

Is this still the state of the art?  What about parsing overhead?

2. Is there a standard mechanism to ensure that unitests run both python and C code?  I believe sys.module['_module'] = None will prevent importing _module.  Is there direct regrtest support for this?

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