从这里开始感觉到了难度。

加油。

装饰器：

1 # Author:yebo 2  3 def fib(max): #10 4     n, a, b = 0, 0, 1 5     while n < max: 6         yield b   #把b返回到外面则yield b 7         a, b = b, a + b 8         n = n + 1 9     return 010 11 g = fib(10)12 while True:13     try:14         x = next(g)   #也可以是: x = g.__next__()15         print('g:', x)16     except StopIteration as e:17         print('Generator return value:', e.value)18         break

升级版：（没有完全明白）

小插曲：在此期间遇到了pycharm可以run但无法进行debug的情况。百度多种方法无果。最后是删除了同目录下的.idea文件，问题才得以解决。

1 __author__ = "Alex Li" 2 import time 3 user,passwd = 'alex','abc123' 4 def auth(auth_type): 5     print("auth func:",auth_type) 6     def outer_wrapper(func): 7         def wrapper(*args, **kwargs): 8             print("wrapper func args:", *args, **kwargs) 9             if auth_type == "local":10                 username = input("Username:").strip()11                 password = input("Password:").strip()12                 if user == username and passwd == password:13                     print("User has passed authentication")14                     res = func(*args, **kwargs)  # from home15                     print("---after authenticaion ")16                     return res17                 else:18                     exit("1mInvalid username or password")19             elif auth_type == "ldap":20                 print("ldap type")21 22         return wrapper23     return outer_wrapper24 25 def index():26     print("welcome to index page")27 28 @auth(auth_type="local") # home = wrapper()29 def home():30     print("welcome to home  page")31     return "from home"32 33 @auth(auth_type="ldap")34 def bbs():35     print("welcome to bbs  page")36 37 index()38 print(home()) #wrapper()39 bbs()

斐波那契数列：

1 # Author:yebo 2  3  4 """ 5 #小知识： 6 a, b = b, a+b 7 #该赋值语句相当于： 8 t = (b, a+b)   #t是一个元组 9 a = t[0]10 b = t[1]11 """12 13 def fib(max):14     n, a, b = 0, 0, 115     while n < max:16         yield b   #变成了一个生成器17         a, b = b, a+b18         n += 119     return 020 21 max = int(input("how many fibnacci number do you want?"))22 f = fib(max)23 print(fib(max))24 print(f.__next__())25 print(f.__next__())26 print(f.__next__())27 print(f.__next__())28 29 print("---start loop---")30 for i in f:31     print(i)   #注意for循环的是i