import timeit
s = """\
    a = 1
    b = 1
    total = 0
    while b < 10:  
        if a%2 == 0:
            total += a
        a,b=b+a,a
"""
t = timeit.Timer(stmt=s)
print "%.4f usec/pass" % ( 1000000*t.timeit(number=100000)/100000)

from math import *


sq5 = sqrt(5)
fi = (1+sq5)/2.0

def Fib(n):
    return int(round(pow(fi, n)/sq5))
    

def FibRev(f):
    return log(sq5*f,fi)

def SumOfEvenValuedFibs(max):
    n = floor(FibRev(max))
    return Fib(n+2)/2