**Problem #2 of Project Euler**

Find the sum of all the even-valued terms in the Fibonacci sequence which do not exceed four million.

**Analysis**

The first 10 terms of Fibonacci sequence are

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …

We need to add the even numbers terms

2 + 8 + 34, ...

### Solution:

def sumEvenFibonacci( limit ):

a, b = 1, 1

sum = 0

while b < limit:

if b%2 == 0: sum += b

a, b = b, a + b

return sum

a, b = 1, 1

sum = 0

while b < limit:

if b%2 == 0: sum += b

a, b = b, a + b

return sum

### Usage:

print sumEvenFibonacci( 4000000 )

If you are interested in listing all the Fibonacci numbers less than a given limit, read this article.