1 #!/usr/bin/env python
2 # -*- coding:utf-8 -*-
3 # Author:woshinidaye
4
5 #装饰器：本质属于函数，语法：def,修饰其他函数，添加附加功能。
6 #类似于版本已经上线运行，现需要在版本中增加新功能，新特性且不能修改原版本文件。
7 #且原函数的调用方式不能被改变。
8
9
10 import time
11 # def decorator(func):
12 # def timer():
13 # start_time = time.time()
14 # func()
15 # end_time = time.time()
16 # print('this function run time is %s' %(end_time-start_time))
17 # return timer
18 # @decorator #test = decorator(test)
19 # def test():
20 # time.sleep(2)
21 # print('this is a test function')
22 # # test = decorator(test) #test的内存地址就是decorator函数的返回值
23 # # test()
24 # test()
25
26 #刚才这个test函数没有参数，在运行时func()时不会报错，但是如果另一个函数，test2有一个参数，这个时候就会出错；
27
28 # def decorator(func):
29 # def timer(args1):
30 # start_time = time.time()
31 # func(args1)
32 # end_time = time.time()
33 # print('this function run time is %s' %(end_time-start_time))
34 # return timer
35 # @decorator #test2 = decorator(test2)
36 # #把test2的内存地址传给decorator函数，decorator函数返回为timer的内存地址，那此时运行test2(’woshinidaye‘)就等于运行timer('woshinidaye')，
37 # #而最开始timer函数是没有变量的，所以会提示TypeError: timer() takes 0 positional arguments but 1 was given
38 # def test2(name):
39 # time.sleep(2)
40 # print('my name is %s' %name)
41 #
42 # # test2() #TypeError: test2() missing 1 required positional argument: 'name'
43 # test2('woshinidaye') #TypeError: timer() takes 0 positional arguments but 1 was given
44
45 #但是在timer函数固定了参数个数，岂不是只能对一个参数的函数装饰，没参数的或者有两个参数的函数都不能被装饰了。这就需要用到非固定参数了。
46 # def decorator(func):
47 # def timer(*args,**kwargs):
48 # start_time = time.time()
49 # func(*args,**kwargs)
50 # end_time = time.time()
51 # print('this function run time is %s' %(end_time-start_time))
52 # return timer
53 # @decorator #test2 = decorator(test2)
54 # def test2(name):
55 # time.sleep(2)
56 # print('my name is %s' %name)
57 # @decorator
58 # def test():
59 # time.sleep(2)
60 # print('this is a test function')
61 # @decorator
62 # def test3(x,y,z=3,*args,**kwargs):
63 # time.sleep(2)
64 # print(x,y)
65 # print(z)
66 # print(args)
67 # print(kwargs)
68 # test()
69 # test2('woshinidaye')
70 # test3(1,2,5,*[1,2,3],**{'name':'woshinidaye','age':13})
71
72 def decorator(func):
73 def timer(*args,**kwargs):
74 start_time = time.time()
75 res = func(*args,**kwargs)
76 end_time = time.time()
77 print('this function run time is %s' %(end_time-start_time))
78 return res
79 return timer
80 @decorator
81 def test4():
82 time.sleep(2)
83 print('\033[032;1m in the func test4 \033[0m')
84 return '======>>> test4'
85
86 print(test4()) #装饰以前，test4()的返回结果是'======>>> test4'
87 # #装饰以后，返回结果为none，这是因为运行test4()其实是运行timer()，而timer并没有返回任何信息
88
89
90 # def test1():
91 # print('in the test1')
92 # return test2()
93 # #return test2 两条命令是不一样的
94 #
95 # def test2():
96 # print('in the test2')
97 # test1()
98 # print(test1())
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