python 装饰器 （多个参数的函数，带参数的装饰器）

最简单的模板是这样的

 1 #-*-coding:utf-8-*-
 2 
 3 def outer(func):
 4     def inner():
 5         print 'before'
 6         func()
 7         print 'after'
 8         # return r
 9     return inner
10 '''
11 def outer_1(func):
12     def inner():
13         print 'before 11'
14         func()
15         print 'after 22'
16         # return r
17     return inner
18 
19 @outer_1
20 '''
21 @outer
22 def F1():
23     print 'test'
24 
25 if __name__ == '__main__':
26     F1()
27 '''
28 运行结果
29 before
30 test
31 after
32 [Finished in 0.1s]
33 '''
View Code

--装饰器也能用2个，把注释打开

函数带多个参数，装饰器对应修改以适合多种情况

 1 # -*- coding: utf-8 -*-
 2 
 3 from time import ctime
 4 from time import sleep
 5 
 6 def ftfunc(func):
 7     def timef(*s,**gs):
 8         print "[%s] %s() called" % (ctime(),func.__name__)
 9         return func(*s,**gs)
10     return timef
11 
12 @ftfunc
13 def foo(*s,**gs):
14     print(s)
15     print(gs)
16 
17 if __name__ == '__main__':
18     foo()
19     foo(1)
20     foo(1,2)
21     foo(1,2,3)
22     stu = {'name' : 'alam' ,'age' :12}
23     foo(1,2,3,**stu)
24 '''
25 运行结果
26 [Wed Jun 14 15:49:55 2017] foo() called
27 ()
28 {}
29 [Wed Jun 14 15:49:55 2017] foo() called
30 (1,)
31 {}
32 [Wed Jun 14 15:49:55 2017] foo() called
33 (1, 2)
34 {}
35 [Wed Jun 14 15:49:55 2017] foo() called
36 (1, 2, 3)
37 {}
38 [Wed Jun 14 15:49:55 2017] foo() called
39 (1, 2, 3)
40 {'age': 12, 'name': 'alam'}
41 [Finished in 0.1s]
42 
43 '''
View Code

函数带多个参数，装饰器也带多个参数

 1 # -*- coding: utf-8 -*-
 2 
 3 def decrator(*dargs, **dkargs):
 4     def wrapper(func):
 5         def _wrapper(*args, **kargs):
 6             print "decrator param:", dargs, dkargs
 7             print "function param:", args, kargs
 8             return func(*args, **kargs)
 9         return _wrapper
10     return wrapper
11 
12 @decrator(1, a=2)
13 def foo(x, y=0):
14     print "foo", x, y
15 
16 
17 if __name__ == '__main__':
18     foo(3, 4)
19 
20 '''
21 执行结果
22 decrator param: (1,) {'a': 2}
23 function param: (3, 4) {}
24 foo 3 4
25 [Finished in 0.1s]
26 '''
View Code

 函数带多个参数，装饰器能转换参数类型

 1 # -*- coding: utf-8 -*-
 2 
 3 def validate(**vkargs):
 4     def decorator(func):
 5         def wrapper(**kargs):
 6             for key in vkargs:
 7                 # 根据vkargs中的参数的类型对kargs的参数进行类型转换
 8                 kargs[key] = vkargs[key](kargs[key])
 9             return func(**kargs)
10         return wrapper
11     return decorator
12 
13 
14 @validate(x=int, y=float, z=float)
15 def move(x, y, z):
16     print "move %d (%0.2f, %0.2f)"%(x, y, z)
17 
18 
19 
20 if __name__ == '__main__':
21     move(x="1", y="0.2", z="0.3")
22 '''
23 运行结果
24 move 1 (0.20, 0.30)
25 [Finished in 0.2s]
26 '''
View Code

 一个简单的例子，登录页面

 1 # -*- coding: utf-8 -*-
 2 
 3 #模拟网站登陆访问认证
 4 
 5 name = 'abc'
 6 password='123'
 7 
 8 def certi(model):#装饰器
 9     def outr(fun):#装饰器加参数需要多加一层嵌套
10         def login(*args,**kwargs):#为了兼容各类函数参数，添加 *args,**kwargs 不固定参数
11             if model=='password':
12                 print('enter password')
13                 user_name = raw_input('user_name ').strip()
14                 paswd=raw_input('password ').strip()
15                 if user_name==name and paswd==password:
16                     print('pass')
17                     return fun(*args,**kwargs)
18                 else:
19                     print('error ')
20                     exit()
21             elif model=='lamp':
22                 print('this is lamp')
23                 return fun(*args,**kwargs)
24             else:
25                 print('error')
26         return login
27     return outr
28 
29 
30 def indxe():
31     print('home page !!')
32 
33 @certi(model='password')
34 def user():
35     print('user page !!')
36 
37 @certi(model='lamp')
38 def bbs(name):
39     print('bbs %s!!'%name)
40 
41 
42 
43 if __name__ == '__main__':
44     indxe()
45     user()
46     bbs(name='yjj')
47 '''
48 运行结果
49 home page !!
50 enter password
51 user_name abc
52 password 123
53 pass
54 user page !!
55 this is lamp
56 bbs yjj!!
57 '''
View Code

 -----------------20170711 再次理解-----------------

1.简单的装饰器

 

2.带参数的装饰器

 3.多个装饰器

 

posted @ 2017-06-14 11:32  AlamZ  阅读(9669)  评论(0)  编辑  收藏  举报