Project Euler - Problem 2

problem2_euler.py

#!/usr/bin/python

End = 4000000
Sum = 2
back = 1
current = 2

def is_even(n):
	return n % 2 == 0

while True :
	num = back + current
	if num < End :
		if is_even(num) == True :
			Sum += num
	else:
		break
	back = current
	current = num

print Sum