[#2] Even Fibonacci numbers

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 problem2(n):
        '''
        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 n,
        find the sum of the even-valued terms.
        '''
        result = 0
        a, b = 0, 1
        while True:
            a, b = b, a + b#find next fibonacci
            if b >= n:
                break
            if b % 2 ==0:#check b in even
                result += b
        return result