day20-python之装饰器
1.装饰器
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import time 4 def cal(l): 5 start_time=time.time() 6 res=0 7 for i in l: 8 time.sleep(0.1) 9 res+=i 10 stop_time = time.time() 11 print('函数的运行时间是%s' %(stop_time-start_time)) 12 return res 13 14 15 16 print(cal(range(100))) 17 18 19 def index(): 20 pass 21 22 def home(): 23 pass
2.装饰器预演
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import time 4 def timmer(func): 5 def wrapper(*args,**kwargs): 6 start_time=time.time() 7 res=func(*args,**kwargs) 8 stop_time = time.time() 9 print('函数运行时间是%s' %(stop_time-start_time)) 10 return res 11 return wrapper 12 13 def timmer1(func): 14 def wrapper(*args,**kwargs): 15 start_time = time.time() 16 res = func(*args,**kwargs) 17 stop_time = time.time() 18 print('函数运行时间是%s' %(stop_time-start_time)) 19 return res 20 return wrapper() 21 22 23 @timmer 24 def cal(l): 25 res=0 26 for i in l: 27 time.sleep(0.1) 28 res+=i 29 return res 30 31 res=cal(range(20)) 32 print(res) 33 34 35 def index(): 36 pass 37 38 def home(): 39 pass
3.高阶函数
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 ''' 4 高阶函数定义: 5 1.函数接收的参数是一个函数名 6 2.函数的返回值是一个函数名 7 3.满足上述条件任意一个,都可称之为高阶函数 8 ''' 9 # import time 10 # def foo(): 11 # time.sleep(3) 12 # print('你好啊林师傅') 13 14 # def test(func): 15 # # print(func) 16 # start_time=time.time() 17 # func() 18 # stop_time = time.time() 19 # print('函数运行时间是 %s' % (stop_time-start_time)) 20 # foo() 21 # test(foo) 22 23 # def foo(): 24 # print('from the foo') 25 # def test(func): 26 # return func 27 # res=test(foo) 28 # # print(res) 29 # res() 30 31 32 import time 33 def foo(): 34 time.sleep(3) 35 print('来自foo') 36 37 #不修改foo源代码 38 #不修改foo调用方式 39 40 #多运行了一次，不合格 41 # def timer(func): 42 # start_time=time.time() 43 # func() 44 # stop_time = time.time() 45 # print('函数运行时间是 %s' % (stop_time-start_time)) 46 # return func 47 # foo=timer(foo) 48 # foo() 49 50 51 #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 52 # def timer(func): 53 # start_time=time.time() 54 # return func 55 # stop_time = time.time() 56 # print('函数运行时间是 %s' % (stop_time-start_time)) 57 # 58 # foo=timer(foo) 59 # foo() 60
4.函数嵌套
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 # def bar(): 4 # print('from bar') 5 # 6 # def foo(): 7 # print('from foo') 8 # def test(): 9 # pass 10 11 def father(auth_type): 12 # print('from father %s' %name) 13 def son(): 14 # name='linhaifeng_1' 15 # print('我的爸爸是%s' %name) 16 def grandson(): 17 print('我的爷爷是%s' %auth_type) 18 grandson() 19 # print(locals()) 20 son() 21 # father('linhaifeng') 22 father('filedb')
5.加上返回值
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import time 4 def timmer(func): #func=test 5 def wrapper(): 6 start_time=time.time() 7 res=func() #就是在运行test() 8 stop_time = time.time() 9 print('运行时间是%s' %(stop_time-start_time)) 10 return res 11 return wrapper 12 13 @timmer #test=timmer(test) 14 def test(): 15 time.sleep(3) 16 print('test函数运行完毕') 17 return '这是test的返回值' 18 19 # res=test() #就是在运行wrapper 20 # print(res)
6.加上参数
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import time 4 def timmer(func): #func=test1 5 def wrapper(*args,**kwargs): #test('linhaifeng',age=18) args=('linhaifeng') kwargs={'age':18} 6 start_time=time.time() 7 res=func(*args,**kwargs) #就是在运行test() func(*('linhaifeng'),**{'age':18}) 8 stop_time = time.time() 9 print('运行时间是%s' %(stop_time-start_time)) 10 return res 11 return wrapper 12 13 14 15 # @timmer #test=timmer(test) 16 17 def test(name,age): 18 time.sleep(3) 19 print('test函数运行完毕,名字是【%s】 年龄是【%s】' %(name,age)) 20 return '这是test的返回值' 21 22 @timmer 23 def test1(name,age,gender): 24 time.sleep(1) 25 print('test1函数运行完毕,名字是【%s】 年龄是【%s】 性别【%s】' %(name,age,gender)) 26 return '这是test的返回值' 27 28 res=test('linhaifeng',age=18) #就是在运行wrapper 29 print(res) 30 # test1('alex',18,'male') 31 32 # test1('alex',18,'male') 33 34 35 36 37 38 # def test2(name,age,gender): #test2(*('alex',18,'male','x','y'),**{}) 39 # #name,age,gender=('alex',18,'male','x','y') 40 # print(name) 41 # print(age) 42 # print(gender) 43 # 44 # def test1(*args,**kwargs): 45 # test2(*args,**kwargs) #args=('alex',18,'male','x','y') kwargs={} 46 # 47 # # test2('alex',18,gender='male') 48 # 49 # test1('alex',18,'male')
7.装饰器实现
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 import time 4 def timmer(func): #func=test 5 def wrapper(): 6 # print(func) 7 start_time=time.time() 8 func() #就是在运行test() 9 stop_time = time.time() 10 print('运行时间是%s' %(stop_time-start_time)) 11 return wrapper 12 13 @timmer #test=timmer(test) 14 def test(): 15 time.sleep(3) 16 print('test函数运行完毕') 17 test() 18 19 # res=timmer(test) #返回的是wrapper的地址 20 # res() #执行的是wrapper() 21 22 # test=timmer(test) #返回的是wrapper的地址 23 # test() #执行的是wrapper() 24 25 # @timmer 就相当于 test=timmer(test)
8.验证功能装饰器
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 user_list=[ 4 {'name':'alex','passwd':'123'}, 5 {'name':'linhaifeng','passwd':'123'}, 6 {'name':'wupeiqi','passwd':'123'}, 7 {'name':'yuanhao','passwd':'123'}, 8 ] 9 current_dic={'username':None,'login':False} 10 11 12 def auth_func(func): 13 def wrapper(*args,**kwargs): 14 if current_dic['username'] and current_dic['login']: 15 res = func(*args, **kwargs) 16 return res 17 username=input('用户名：').strip() 18 passwd=input('密码：').strip() 19 for user_dic in user_list: 20 if username == user_dic['name'] and passwd == user_dic['passwd']: 21 current_dic['username']=username 22 current_dic['login']=True 23 res = func(*args, **kwargs) 24 return res 25 else: 26 print('用户名或者密码错误') 27 28 return wrapper 29 30 @auth_func 31 def index(): 32 print('欢迎来到京东主页') 33 34 @auth_func 35 def home(name): 36 print('欢迎回家%s' %name) 37 38 @auth_func 39 def shopping_car(name): 40 print('%s的购物车里有［%s,%s,%s］' %(name,'奶茶','妹妹','娃娃')) 41 42 print('before-->',current_dic) 43 index() 44 print('after--->',current_dic) 45 home('产品经理') 46 shopping_car('产品经理')
10.带参数验证功能装饰器
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 user_list=[ 4 {'name':'alex','passwd':'123'}, 5 {'name':'linhaifeng','passwd':'123'}, 6 {'name':'wupeiqi','passwd':'123'}, 7 {'name':'yuanhao','passwd':'123'}, 8 ] 9 current_dic={'username':None,'login':False} 10 11 def auth(auth_type='filedb'): 12 def auth_func(func): 13 def wrapper(*args,**kwargs): 14 print('认证类型是',auth_type) 15 if auth_type == 'filedb': 16 if current_dic['username'] and current_dic['login']: 17 res = func(*args, **kwargs) 18 return res 19 username=input('用户名：').strip() 20 passwd=input('密码：').strip() 21 for user_dic in user_list: 22 if username == user_dic['name'] and passwd == user_dic['passwd']: 23 current_dic['username']=username 24 current_dic['login']=True 25 res = func(*args, **kwargs) 26 return res 27 else: 28 print('用户名或者密码错误') 29 elif auth_type == 'ldap': 30 print('鬼才特么会玩') 31 res = func(*args, **kwargs) 32 return res 33 else: 34 print('鬼才知道你用的什么认证方式') 35 res = func(*args, **kwargs) 36 return res 37 38 return wrapper 39 return auth_func 40 41 @auth(auth_type='filedb') #auth_func=auth(auth_type='filedb')-->@auth_func 附加了一个auth_type --->index=auth_func(index) 42 def index(): 43 print('欢迎来到京东主页') 44 45 @auth(auth_type='ldap') 46 def home(name): 47 print('欢迎回家%s' %name) 48 # 49 @auth(auth_type='sssssss') 50 def shopping_car(name): 51 print('%s的购物车里有［%s,%s,%s］' %(name,'奶茶','妹妹','娃娃')) 52 53 # print('before-->',current_dic) 54 # index() 55 print('after--->',current_dic) 56 home('产品经理') 57 # shopping_car('产品经理')
