day20-python之装饰器

1.装饰器

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 import time
 def cal(l):
     start_time=time.time()
     res=0
     for i in l:
         time.sleep(0.1)
         res+=i
     stop_time = time.time()
     print('函数的运行时间是%s' %(stop_time-start_time))
     return res

 print(cal(range(100)))

 def index():
     pass

 def home():
     pass

2.装饰器预演

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 import time
 def timmer(func):
     def wrapper(*args,**kwargs):
         start_time=time.time()
         res=func(*args,**kwargs)
         stop_time = time.time()
         print('函数运行时间是%s' %(stop_time-start_time))
         return res
     return wrapper

 def timmer1(func):
     def wrapper(*args,**kwargs):
         start_time = time.time()
         res = func(*args,**kwargs)
         stop_time = time.time()
         print('函数运行时间是%s' %(stop_time-start_time))
         return res
     return wrapper()

 @timmer
 def cal(l):
     res=0
     for i in l:
         time.sleep(0.1)
         res+=i
     return res

 res=cal(range(20))
 print(res)

 def index():
     pass

 def home():
     pass

3.高阶函数

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 '''
 高阶函数定义:
 1.函数接收的参数是一个函数名
 2.函数的返回值是一个函数名
 3.满足上述条件任意一个,都可称之为高阶函数
 '''
 # import time
 # def foo():
 #     time.sleep(3)
 #     print('你好啊林师傅')

 # def test(func):
 #     # print(func)
 #     start_time=time.time()
 #     func()
 #     stop_time = time.time()
 #     print('函数运行时间是  %s' % (stop_time-start_time))
 # foo()
 # test(foo)

 # def foo():
 #     print('from the foo')
 # def test(func):
 #     return func
 # res=test(foo)
 # # print(res)
 # res()

 import time
 def foo():
     time.sleep(3)
     print('来自foo')

 #不修改foo源代码
 #不修改foo调用方式

 #多运行了一次，不合格
 # def timer(func):
 #     start_time=time.time()
 #     func()
 #     stop_time = time.time()
 #     print('函数运行时间是  %s' % (stop_time-start_time))
 #     return func
 # foo=timer(foo)
 # foo()

 #没有修改被修饰函数的源代码，也没有修改被修饰函数的调用方式，但是也没有为被修饰函数添加新功能
 # def timer(func):
 #     start_time=time.time()
 #     return func
 #     stop_time = time.time()
 #     print('函数运行时间是  %s' % (stop_time-start_time))
 #
 # foo=timer(foo)
 # foo()
  

4.函数嵌套

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # def bar():
 #     print('from bar')
 #
 # def foo():
 #     print('from foo')
 #     def test():
 #         pass

 def father(auth_type):
     # print('from father %s' %name)
     def son():
         # name='linhaifeng_1'
         # print('我的爸爸是%s' %name)
         def grandson():
             print('我的爷爷是%s' %auth_type)
         grandson()
     # print(locals())
     son()
 # father('linhaifeng')
 father('filedb')

5.加上返回值

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 import time
 def timmer(func): #func=test
     def wrapper():
         start_time=time.time()
         res=func() #就是在运行test()
         stop_time = time.time()
         print('运行时间是%s' %(stop_time-start_time))
         return res
     return wrapper

 @timmer #test=timmer(test)
 def test():
     time.sleep(3)
     print('test函数运行完毕')
     return '这是test的返回值'

 # res=test()  #就是在运行wrapper
 # print(res)

6.加上参数

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 import time
 def timmer(func): #func=test1
     def wrapper(*args,**kwargs): #test('linhaifeng',age=18)  args=('linhaifeng')  kwargs={'age':18}
         start_time=time.time()
         res=func(*args,**kwargs) #就是在运行test()         func(*('linhaifeng'),**{'age':18})
         stop_time = time.time()
         print('运行时间是%s' %(stop_time-start_time))
         return res
     return wrapper

 # @timmer #test=timmer(test)

 def test(name,age):
     time.sleep(3)
     print('test函数运行完毕,名字是【%s】 年龄是【%s】' %(name,age))
     return '这是test的返回值'

 @timmer
 def test1(name,age,gender):
     time.sleep(1)
     print('test1函数运行完毕,名字是【%s】 年龄是【%s】 性别【%s】' %(name,age,gender))
     return '这是test的返回值'

 res=test('linhaifeng',age=18)  #就是在运行wrapper
 print(res)
 # test1('alex',18,'male')

 # test1('alex',18,'male')

 # def test2(name,age,gender): #test2(*('alex',18,'male','x','y'),**{})
 #     #name,age,gender=('alex',18,'male','x','y')
 #     print(name)
 #     print(age)
 #     print(gender)
 #
 # def test1(*args,**kwargs):
 #     test2(*args,**kwargs)  #args=('alex',18,'male','x','y') kwargs={}
 #
 # # test2('alex',18,gender='male')
 #
 # test1('alex',18,'male')

7.装饰器实现

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 import time
 def timmer(func): #func=test
     def wrapper():
         # print(func)
         start_time=time.time()
         func() #就是在运行test()
         stop_time = time.time()
         print('运行时间是%s' %(stop_time-start_time))
     return wrapper

 @timmer #test=timmer(test)
 def test():
     time.sleep(3)
     print('test函数运行完毕')
 test()

 # res=timmer(test)  #返回的是wrapper的地址
 # res()  #执行的是wrapper()

 # test=timmer(test)  #返回的是wrapper的地址
 # test()  #执行的是wrapper()

 #  @timmer  就相当于 test=timmer(test)

8.验证功能装饰器

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 user_list=[
     {'name':'alex','passwd':''},
     {'name':'linhaifeng','passwd':''},
     {'name':'wupeiqi','passwd':''},
     {'name':'yuanhao','passwd':''},
 ]
 current_dic={'username':None,'login':False}

 def auth_func(func):
     def wrapper(*args,**kwargs):
         if current_dic['username'] and current_dic['login']:
             res = func(*args, **kwargs)
             return res
         username=input('用户名：').strip()
         passwd=input('密码：').strip()
         for user_dic in user_list:
             if username == user_dic['name'] and passwd == user_dic['passwd']:
                 current_dic['username']=username
                 current_dic['login']=True
                 res = func(*args, **kwargs)
                 return res
         else:
             print('用户名或者密码错误')

     return wrapper

 @auth_func
 def index():
     print('欢迎来到京东主页')

 @auth_func
 def home(name):
     print('欢迎回家%s' %name)

 @auth_func
 def shopping_car(name):
     print('%s的购物车里有［%s,%s,%s］' %(name,'奶茶','妹妹','娃娃'))

 print('before-->',current_dic)
 index()
 print('after--->',current_dic)
 home('产品经理')
 shopping_car('产品经理')

10.带参数验证功能装饰器

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 user_list=[
     {'name':'alex','passwd':''},
     {'name':'linhaifeng','passwd':''},
     {'name':'wupeiqi','passwd':''},
     {'name':'yuanhao','passwd':''},
 ]
 current_dic={'username':None,'login':False}

 def auth(auth_type='filedb'):
     def auth_func(func):
         def wrapper(*args,**kwargs):
             print('认证类型是',auth_type)
             if auth_type == 'filedb':
                 if current_dic['username'] and current_dic['login']:
                     res = func(*args, **kwargs)
                     return res
                 username=input('用户名：').strip()
                 passwd=input('密码：').strip()
                 for user_dic in user_list:
                     if username == user_dic['name'] and passwd == user_dic['passwd']:
                         current_dic['username']=username
                         current_dic['login']=True
                         res = func(*args, **kwargs)
                         return res
                 else:
                     print('用户名或者密码错误')
             elif auth_type == 'ldap':
                 print('鬼才特么会玩')
                 res = func(*args, **kwargs)
                 return res
             else:
                 print('鬼才知道你用的什么认证方式')
                 res = func(*args, **kwargs)
                 return res

         return wrapper
     return auth_func

 @auth(auth_type='filedb') #auth_func=auth(auth_type='filedb')-->@auth_func 附加了一个auth_type  --->index=auth_func(index)
 def index():
     print('欢迎来到京东主页')

 @auth(auth_type='ldap')
 def home(name):
     print('欢迎回家%s' %name)
 #
 @auth(auth_type='sssssss')
 def shopping_car(name):
     print('%s的购物车里有［%s,%s,%s］' %(name,'奶茶','妹妹','娃娃'))

 # print('before-->',current_dic)
 # index()
 print('after--->',current_dic)
 home('产品经理')
 # shopping_car('产品经理')