python---装饰器

 1 import time
 2 def deco(func):
 3     def wraper(*args):
 4         start_time = time.time()
 5         func(*args)
 6         stop_time = time.time()
 7         print("running time is:",stop_time - start_time)
 8     return wraper
 9 
10 @deco       #等于test1 = deco(test1) 返回值为wraper的内存地址，即test1等于wraper,所有*args同样可以传递给wraper
11 def test1(*args):
12     print("test1".center(30,"-"))
13     print("values is",*args)
14 test1(1,2,3)
15 
16 
17 user = "jack"
18 def auth(auth_type):
19     def outer_wraper(func):
20         def wraper(*args,**kwargs):
21             if auth_type=="local":
22                 username = input("username:").strip()
23                 if user == username:
24                     print("success!")
25                     res = func()
26                     return res
27                 else:
28                     print("invalid input")
29         return wraper
30     return outer_wraper
31 
32 @auth(auth_type="local")    #即这里多了一个参数，这个参数需要传递给auth函数，多了这个参数可以再装饰器内加判断
33 def home():
34     print("home page")
35 
36 home()