https://projecteuler.net/problem=2

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

def sumFib(n):
    result = 0
    first = 1
    second = 1
    while True:
        first,second = second,first + second
        if second > n:
            break
        elif second % 2 == 0:
            result += second
    return result

print(sumFib(4000000))