Stefan Behnel added the comment:
> it might be worth at least considering how a 'one or more parameter' gcd
> compares on performance grounds with a two parameter one.
There shouldn't be a difference in practice. The bulk of the work is in the
algorithm that finds the GCD of two numbers, and finding the GCD of multiple
numbers is simply
functools.reduce(math.gcd, seq_of_numbers)
Since the most common use case is finding the GCD of two numbers, I don't see a
reason to burden the implementation with a special case here.
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<http://bugs.python.org/issue22477>
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