Elegant as fuck

def fib(times):
    a, b = 0,1
    for _ in range(times):
        a, b = b, a+b
    return a

I think I just creamed my pants.

First, for the second command, you would use fibs !! 1000000000, as fibs is a list, not a function.
Second, the space requirements will literally murder your computer, as the system allocates a billion bignums.