装饰器

 1 import time
 2 
 3 def outer(func):
 4     def inner(*args,**kwargs):
 5         s_time = time.time()
 6         func(*args,**kwargs)
 7         e_time = time.time()
 8         print(e_time - s_time)
 9     return inner
10 
11 @outer
12 def add(*args,**kwargs):
13     print("try")
14     time.sleep(2)
15 
16 add()