userlist = [     {'name':'doudou','passwd':'123'},     {'name':'chouchou','passwd':'456'},     {'name':'liuhaiquan','passwd':'789'},     {'name':'liuxue','passwd':'2020'} ] current_list = {'username':None,'login':False} #定义一个空的全局变量 def jingdong(yanzheng):     def yonghu(*args,**kwargs):         if current_list['username'] and current_list['login']: #判断是否已经有用户输入             res = yanzheng(*args,**kwargs)  #运行装饰器             return res         username = input('用户名： ').strip()         passwd = input('密码： ').strip()         for user_dic in userlist:             if username == user_dic['name'] and passwd == user_dic['passwd']:                 current_list['username'] = username                 current_list['login'] = True                 res = yanzheng(*args,**kwargs) #运行装饰器                 return res         else:  #如果for循环结束为止，还是没有验证成功，则打印密码或用户错误             print('用户或密码错误')     return yonghu @jingdong def desk(name):     print('欢迎来到京东 %s' %name) @jingdong def shopcar(name):     print('%s 的购物车里有[%s,%s,%s]' %(name,'水果','饮料','饼干')) @jingdong def mina(name):     print('显示%s的主页' %name) desk('chouchou') shopcar('dd') mina('kl')