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.

斐波那契数列中的每一项被定义为前两项之和。要求找出该数列中值为不超过 4 百万的偶数的项之和。

我的python代码：

first = 1
last =2 
sum = 2
while 1 :
    last = first + last;
    first = last - first; 
    if last<4000000 :
        if last%2==0:
            
            sum+=last
    else:
        break;
print sum

你知道有更好的可以留言啊，大家互相学习啊！