装饰器

Posted 2020-09-09 nayike

 

 

无参装饰器修正（函数参数的对应关系）

 1 import time
 2 
 3 def timmer(func):
 4     def wrapper(name):   #  name与‘pangdi’ 的对应关系
 5         start = time.time()
 6         func(name)       # name
 7         stop = time.time()
 8         print(‘run time is {}‘.format(stop-start))
 9     return wrapper
10 
11 @timmer
12 def home(name):
13     time.sleep(1)
14     print(‘welcome to {} home page‘.format(name))
15 
16 home(‘pangdi‘)  #相当于 wrapper(‘pangdi‘)

 

 1 import time
 2 
 3 def timmer(func):
 4     def wrapper(name,password):   #  name,password 与 auth(‘Tom‘,‘123‘) 对应
 5         start = time.time()
 6         func(name,password)       # name
 7         stop = time.time()
 8         print(‘run time is {}‘.format(stop-start))
 9     return wrapper
10 
11 
12 @timmer
13 def auth(name,password):
14     print(name,password)
15 
16 auth(‘Tom‘,‘123‘)
17 
18 #运行结果
19 Tom 123
20 run time is 0.0005013942718505859

简例二（双参数的调用）

 

# *args,**kwargs的特性：面对参数值，有则全收，无则为None

 

 1 import time
 2 
 3 def timmer(func):
 4     def wrapper(*args,**kwargs):   #  与 home(‘pangdi‘),auth(‘Tom‘,‘123‘)对应
 5         start = time.time()
 6         func(*args,**kwargs)
 7         stop = time.time()
 8         print(‘run time is {}‘.format(stop-start))
 9     return wrapper
10 
11 
12 @timmer
13 def home(name):
14     time.sleep(1)
15     print(‘welcome to {} home page‘.format(name))
16 
17 
18 @timmer
19 def auth(name,password):
20     print(name,password)
21 
22 home(‘pangdi‘)   #一个参数值
23 print(‘--‘*16)
24 auth(‘Tom‘,‘123‘)  #两个参数

*args,**kwargs  在修正的使用