utimer

import time

class uTimer(object):
        
    def __enter__(self):
        self.begin_time=time.time()
        self.end_time=0.0
        self.delta=0.0
        
    def __exit__(self, type, value, tb):
        self.end_time=time.time()
        self.delta = self.end_time - self.begin_time


def fib(n):
    if n==0: return 1
    if n==1: return 1
    return fib(n-1)+fib(n-2)

t=uTimer()

for i in range(1,40):
    with t:
        print i,fib(i)

    print "Time was %f" % t.delta