# 1、编写课上讲解的有参装饰器准备明天默写 def muth(file_data): def login(func): def wrap(*args,**kwargs): if file_data == 'file': dic = {} username = input('请输入账号:').strip() userpwd = input('请输入密码:').strip() with open('a.txt',mode='r',encoding='utf-8') as f: for i in f: k,v = i.strip().split(':') dic[k] = v if username in dic and userpwd == dic[username]: print('登陆成功') res = func(*args,**kwargs) return res else: print('账号密码错误') elif file_data == 'mysql': print('使用mysql登录成功') res = func(*args,**kwargs) return res elif file_data == 'ldap': print('使用ldap登录') res = func(*args,**kwargs) return res else: print('登录方式不对') return wrap return login @muth('file') def foo(): print('hello world') foo() @muth('mysql') def foo(): print('hello world') foo() @muth('ldap') def foo(): print('hello world') foo() @muth('a') def foo(): print('hello world') foo() # 2:还记得我们用函数对象的概念,制作一个函数字典的操作吗,来来来,我们有更高大上的做法,在文件开头声明一个空字典,然后在每个函数前加上装饰器,完成自动添加到字典的操作 dic = {} def make(ch): def wrap(func): def inner(): dic[ch] = func() return dic[ch] return inner return wrap @make('yu') def select(): return 123 @make('egon') def update(): return 456 select() update() print(dic) # 3、 编写日志装饰器,实现功能如:一旦函数f1执行,则将消息2017-07-21 11:12:11 f1 run写入到日志文件中,日志文件路径可以指定 # 注意:时间格式的获取 # import time # time.strftime('%Y-%m-%d %X') import time def file(file_path): def make(func): def wrapper(*args,**kwargs): with open(file_path,mode='a+',encoding='utf-8') as f: data_time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())) f.write('{} {} run '.format(data_time,func.__name__)) res = func(*args, **kwargs) return res return wrapper return make @file('b.txt') def f1(): print(1) f1() # 4、基于迭代器的方式,用while循环迭代取值字符串、列表、元组、字典、集合、文件对象 def data(info): res = iter(info) while True: try: print(next(res)) except StopIteration: break data('123') data([1,2,3,4]) data((1,2,3,4)) data({1:2,3:4}) data({1,2,3,4}) with open('a.txt',mode='r',encoding='utf-8') as info: data(info) # 5、自定义迭代器实现range功能 def my_range(start,stop,step): while start < stop: print(start) start += step my_range(1,9,3)