Fibonacci for CodeEval

Just to have some fun, I was solving a not too complex problem on CodeEval. The description was sort of dodgy, but in the end I understood that it boiled down to calculate the Fibonacci number of the values passed as input (increased by one, to make the waters a bit muddier). I usually play those games in C++, that is my preferred programming language. Alas, on CodeEval we are forced to use a 32 bit C++98 compiler. Not exactly what you could call a state of the art tool. This is particularly annoying in this case, where I need to calculate huge numbers as the Fibonacci ones are. Luckily my basic knowledge of Python is enough to get me out of it. Here is my 2.7 solution, I know it is nothing special, but it sufficed to get me a shiny 100%:

import sys


def fib(n):
    if n == 0:
       return 0

    prev, cur = 0, 1
    for i in range(n - 1):
        prev, cur = cur, prev + cur
    return cur


if __name__ == '__main__':
    for line in open(sys.argv[1]):
        if len(line) > 0:
            print fib(int(line) + 1)