Serhiy Storchaka added the comment:

C implementation almost everywhere (except strftime/strptime) accepts long as 
well as int, but not general integral numbers. Python implementation of the 
datetime module is not entire compatible with C implementation (default in 
CPython), therefore alternative Python implementations that doesn't use an 
accelerator is incompatible with CPython. I consider this as a bug and think 
that we should weak some of checks isinstance(..., int) to isinstance(..., 
(int, long)). numbers.Integral is too wide type, C implementation doesn't 
support it.

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nosy: +belopolsky, serhiy.storchaka
stage:  -> needs patch
type: enhancement -> behavior

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25714>
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