pypy vs cpython

#!/usr/bin/python
import time

def elapsed_time(functor):
     def decorated(*args, **kwargs):
             start = time.time()
             functor()
             end = time.time()
             print "Elapsed time: %f" % (end-start)
     return decorated

@elapsed_time
def sum_function():
    sum = 0
    #for i in xrange(1,1000000+1,1):
    for i in xrange(1,1000000000+1,1):
        sum += i

    print sum

if __name__ == "__main__":
    sum_function()