[issue19562] Added description for assert statement

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

@terry - datetime.py was originally written as a prototype for the C code and many seemingly unpythonic constructs therein are motivated by the desire to ease the translation to C.

I would not mind simplifying _DI4Y calculation as you suggest, but please check how it is done in C.  I would like to keep the two implementation as similar as possible.

Please open a separate issue if you would like to have this done.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19562>
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