Python 函数 VI

Posted 2020-11-24 xingchenck

1.今日内容大纲

1. 带参数的装饰器
2. 多个装饰器装饰一个函数
3. 递归函数

2.具体内容

1. 带参数的装饰器

   def wrapper_out(n):
     def wrapper(f):
       def inner(*args,**kwargs):
         username = input('用户名：').strip()
         password = input('密码：').strip()
         with open (n)as f :
           for line in f:
             user,pwd = line.strip().split('|')
             if username == user and password == pwd:
               print('登录成功')
               ret = f(*args,**kwargs)
               return ret
            print('用户名或密码错误')
        return inner
      return wrapper
   
   
   @wrapper_out('qq')
   def qq():
     print('成功访问qq')
   
   @wrapper_out('dy')
   def dy():
     print('成功访问抖音')
   
   qq()
   dy()

2. 多个装饰器装饰一个函数

   def wrapper1(func1):
     def inner1():
       print('wrapper1 before func')#2
       func1()#3
       print('wrapper1 after func')#4
     return inner1
   def wrapper2(func2):
     def inner2():
       print('wrapper2 before func') #1
       func2()
       print('wrapper2 after func')#5
     return inner2
   
   @wrapper2  #f = wrapper2(f) f内 = inner1;f外 = inner2
   @wrapper1  #f = wrapper1(f) f内 = f();   f外 = inner1
   def f():
     print(666)#3
   f()
   

3. 递归函数

   def age(n):
     if n == 1:
       return 18
     else:
       return age(n-1)+2
   ret = age(8)
   print(ret)
   
   l2 = [1, 3, 5, ['太白','元宝', 34, [33, 55, [11,33]]], [77, 88],66]
   def func(l):
     for i in l:
       if type(i) == list:
         func(i)
       else:
         print(i)
   func(l2)
   
   def func(n):
     if n == 1:
       h = 1
     elif n == 2:
       h = 1
     else:
       h = func(n-1)+func(n-2)
     return h
   func(6)