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.

def run(n):
        if n <= 2:
                return 2
        prev = 0
        cur = 1
        s = 0
        while True:
                prev , cur = cur , prev + cur
                if cur >= n:break
                if (cur & 1) == 0:
                        s += cur
        return s
 print run(4000000)