[issue22486] Add math.gcd()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I suggest just add deprecation warning in fractions.gcd(). Or at least add 
notes which recommend math.gcd() in the docstring and the documentation of 
fractions.gcd().

> One other suggestion: I think math.gcd should work with arbitrary Python
> objects implementing __index__, and not just with instances of int.

Agree.

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<http://bugs.python.org/issue22486>
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