装饰器、生成器，迭代器、Json & pickle 数据序列化

1 a=[i*2 for i in range(10)]
2 print(a)
3 
4 运行效果如下：
5 D:\python35\python.exe D:/python培训/s14/day4/列表生成式.py
6 [0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
7 
8 Process finished with exit code 0

 1 def test():
 2     print("int the test")
 3 
 4 def test2(func):
 5     print("in the test2")
 6     print(func)
 7     func()
 8 
 9 test2(test)
10 运行效果如下：
11 D:\python35\python.exe D:/python培训/s14/day4/高阶函数.py
12 in the test2
13 <function test at 0x000000000110E268>  #这里是test的内存地址
14 int the test
15 
16 Process finished with exit code 0

 1 import  time
 2 def timeer(func):
 3     def warpper():
 4         start_time=time.time()
 5         func()
 6         stop_time=time.time()
 7         print("the fun runn time is %s" %(stop_time-start_time))
 8     return warpper
 9 @timeer
10 def test1():
11     time.sleep(3)
12     print("in the test1")
13 
14 test1()
15 运行结果如下：
16 D:\python35\python.exe D:/python培训/s14/day4/装饰器.py
17 in the test1
18 the fun runn time is 3.000171661376953
19 
20 Process finished with exit code 0

 1 import time
 2 
 3 def timer(func):
 4     def deco(*args,**kwargs):
 5         start_time=time.time()
 6         func(*args,**kwargs)
 7         stop_time=time.time()
 8         print("the func runn time is %s" %(stop_time-start_time))
 9     return deco
10 
11 @timer  #test1 = timer(test1)
12 def test1():
13     time.sleep(3)
14     print("in the test1")
15 
16 @timer
17 
18 def test2(name,age):
19     print("name:%s,age:%s" %(name,age))
20 
21 test1()
22 test2("zhaofan",23)
23 运行结果如下：
24 
25 D:\python35\python.exe D:/python培训/s14/day4/装饰器3.py
26 in the test1
27 the func runn time is 3.000171661376953
28 name:zhaofan,age:23
29 the func runn time is 0.0
30 
31 Process finished with exit code 0

 1 import time
 2 user,passwd = "zhaofan","123"
 3 def auth(auth_type):
 4     print("auth func:",auth_type)
 5     def outer_wrapper(func):
 6         def wrapper(*args,**kwargs):
 7             if auth_type=="local":
 8                 username = input("Username:").strip()
 9                 password = input("Password:").strip()
10                 if user == username and passwd== password:
11                     print("\033[32;1mUser has passed authentication\033[0m")
12                     res = func(*args,**kwargs)
13                     print("------after authentication")
14                     return res
15                 else:
16                     exit("\033[31;1mInvalid username or password\033[0m")
17             elif auth_type=="ldap":
18                 print("没有ldap")
19         return wrapper
20     return outer_wrapper
21 
22 def index():
23     print("welcome to index page")
24 @auth(auth_type="local")
25 def home():
26     print("welcome to home page")
27     return "from home"
28 @auth(auth_type="ldap")
29 def bbs():
30     print("welcome to bbs page")
31 
32 index()
33 print(home())
34 bbs()
35 
36 
37 运行结果如下：
38 D:\python35\python.exe D:/python培训/s14/day4/装饰器4.py
39 auth func: local
40 auth func: ldap
41 welcome to index page
42 Username:zhaofan
43 Password:123
44 User has passed authentication
45 welcome to home page
46 ------after authentication
47 from home
48 没有ldap
49 
50 Process finished with exit code 0

 1 a = [x for x in range(10)]
 2 print(a)
 3 
 4 g=(x for x in range(10))
 5 print(g)
 6 运行结果如下：
 7 D:\python35\python.exe D:/python培训/s14/day4/生成器.py
 8 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
 9 <generator object <genexpr> at 0x0000000000B01DB0>
10 
11 Process finished with exit code 0

 1 g=(x for x in range(10))
 2 
 3 for i in g:
 4     print(i)
 5 
 6 
 7 运行结果如下：
 8 
 9 D:\python35\python.exe D:/python培训/s14/day4/生成器的调用.py
10 0
11 1
12 2
13 3
14 4
15 5
16 6
17 7
18 8
19 9
20 
21 Process finished with exit code 0