[issue39648] Update math.gcd() to accept "n" arguments.

[Ananthakrishnan]

Ananthakrishnan <ananthakrishnan15.2001 at gmail.com> added the comment:

It should take variable number of positional arguments.
it should return:
>>math.gcd()
0
>>math.gcd(8)
8
>>math.gcd(-8)
8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39648>
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