program 2 in Euler

p2.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

def fibo():
    a, b = 1, 2
    while True:
        yield a
        a, b = b, a + b

ans = []
limit = 4000 * (10 ** 3)
f = fibo()
while True:
    even = next(f)
    print even
    if even > limit:
        break;
    if even % 2 == 0:
        ans.append(even)   

print ans
print reduce(lambda x, y: x + y, ans)