import time def timer def tmp args kwargs time time res args kwargs pr

import time
def timer(f):
    def tmp(*args, **kwargs):
        t = time.time()
        res = f(*args, **kwargs)
        print "time func: %f" % (time.time()-t)
        return res

    return tmp

@timer
def func1():
    for i in xrange(10000):
        s = '{}{}'.format(1, 2)


@timer
def func2():
    for i in xrange(10000):
        s = '{0}{1}'.format(1, 2)

func1() # time func: 0.003652

func2() # time func: 0.003862