GCD in standard library?

[Erik Max Francis]

Blake Garretson wrote:

> I'm just guessing it is very common
> for people to have to add this to their programs:
> 
> def gcd(x,y):
>   if x % y == 0: return y
>   else: return gcd(y,x%y)

I would hope you'd use the iterative form.  Function calls are
expensive, and can't recurse to arbitrary depths.

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