用装饰器实现打印时间

import time
def b(func):
    def call_time(*args,**kwargs):
        start_time=time.time()
        ret=func(*args,**kwargs)
        end_time=time.time()
        c=end_time-start_time
        print(c)
    return call_time
@b
def test(*args,**kwargs):
    for i in range(100):
        print(i)
test()