Python进阶笔记：深入理解装饰器、生成器与迭代器的应用

1 def outer(fun):
2 def warper():
3 print("outer 1")
4 fun() #相当于把下边两个函数当参数传入进来
5 print("outer 3")
6 return warper
7
8 &＃64;outer
9 def test1():
10 print("test1 2")
11 &＃64;outer
12 def test2():
13 print("test2 2")
14 test1()
15 test2()
-----------------结果-----------------
16 outer 1
17 test1 2
18 outer 3
19 outer 1
20 test2 2
21 outer 3

1 def outer(fun):
2 def warper(*args,**kwargs):
3 print("加的第一个功能在函数之前")
4 fun(*args,**kwargs)
5 print("加的第二个功能在函数之后")
6 return warper
7
8 &＃64;outer
9 def test1(*args,**kwargs):
10 print(args,kwargs)
11 return
12
13
14 test1(123,"waa","yyy",name&＃61;"wsy",Age&＃61;18)
15 ----------------结果----------------------
16 加的第一个功能在函数之前
17 (123, &＃39;waa&＃39;, &＃39;yyy&＃39;) {&＃39;name&＃39;: &＃39;wsy&＃39;, &＃39;Age&＃39;: 18}
18 加的第二个功能在函数之后

import timedef timer(func):def deco(*args,**kwargs):start &＃61; time.time()print("装饰器&＃xff1a;功能1")func(*args,**kwargs)print("装饰器&＃xff1a;功能2")end &＃61; time.time()print("func run time is %s" %(end - start))return deco&＃64;timer
def test1():time.sleep(1)print("in the test1")
&＃64;timer
def test2(*args,**kwargs):time.sleep(1)print("in the test1",args,kwargs)test1()
test2(1,2,3,4,name&＃61;"wsy",age&＃61;20)
--------------------结果------------------------
装饰器&＃xff1a;功能1
in the test1
装饰器&＃xff1a;功能2
func run time is 1.0000572204589844
装饰器&＃xff1a;功能1
in the test1 (1, 2, 3, 4) {&＃39;name&＃39;: &＃39;wsy&＃39;, &＃39;age&＃39;: 20}
装饰器&＃xff1a;功能2
func run time is 1.0000572204589844

1 user,passwd &＃61; "wsy","123"
2 def auth(auth_type):
3 print("auth func:",auth_type)
4 def outer_wrapper(func):
5 def wrapper(*args,**kwargs):
6 print("wrapper func args:", *args,**kwargs)
7 if auth_type &＃61;&＃61; "local": # 如果装饰器参数是local 就
8 username &＃61; input("Username:").strip() # 输入用户名
9 password &＃61; input("Password:").strip() # 输入密码
10 if user &＃61;&＃61; username and passwd &＃61;&＃61; password: # 判断如果正确
11 print("\033[32;1mUser has passwd authentication\033[0m")
12 res &＃61; func(*args,**kwargs) #from home
13 print("-------after authenticaion")
14 return res
15 else:
16 exit("\033[31;1mInvalid username or password \033[0m")
17 elif auth_type &＃61;&＃61; "ldap": # 如果装饰器参数是ldap
18 print("hehe")
19 return wrapper
20 return outer_wrapper
21
22
23 def index():
24 print("welcome to index page")
25
26 &＃64;auth(auth_type&＃61;"local")
27
28 def home():
29 print("welcome to home page")
30 return "from home"
31 &＃64;auth(auth_type&＃61;"ldap")
32 def bbs():
33 print("welcome to bbs page")
34 index()
35 print (home())
36 bbs()
37 -----------------------结果-----------------------
38 auth func: local
39 auth func: ldap
40 welcome to index page
41 wrapper func args:
42 Username:wsy
43 Password:123
44 User has passwd authentication
45 welcome to home page
46 -------after authenticaion
47 from home
48 wrapper func args:
49 hehe