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

[Alexander Belopolsky]

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

I am attaching a patch from issue 5288 as an example of a change that I would favor more than issue7989-cmp.diff.  This patch eliminates _utcoffset and _dst methods that duplicate utcoffset and dst, but return integer minutes rather than a timedelta.

I am not checking these changes in sandbox because these are examples of how I plan to improve C implementation when datetime.py makes it into the main tree.  I envision such changes to be discussed within context of datetime.py and if approved, implemented in C and committed simultaneously.

Improving datetime.py implementation and making it diverge from C implementation defeats the purpose I see in having datetime.py in the first place.

Antoine?

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Added file: http://bugs.python.org/file17845/issue5288-proto.diff

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