Problem 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.

加和Fibonacci数列的偶数值。

fibonacci = [1,2]
maximum = 4000000
summary = 2

while True:
    fibonacci.append(fibonacci[-2] + fibonacci[-1])
    if fibonacci[-1] > maximum:
        break
    if fibonacci[-1] % 2 == 0:
        summary += fibonacci[-1]

print summary