prob2 Euler

#! /usr/bin/python
import sys
from ArcFP import *

# Author : Arcaed0x (Adrian Nwankwo)

def fibs(lim):
    n1 , n2 , ns = 1 , 2 , 0
    while True:
        ns = n1 + n2
        if ns <= lim:
            yield ns
        else:
            break
        n1 = n2
        n2 = ns


filtNums = filter(even, chain( iter([1,2]) ,fibs(4000000)) )

def main(args):
    print(sum(filtNums))

if __name__ == '__main__':
    main(sys.argv)