Project Euler 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. ''' from math import * m=4000000 i1=1 i2=2 s=0 while i1<m: print i1 if i1%2==0: s+=i1 t=i2 i2=i1+i2 i1=t print s