Python简单实现多级菜单

 # -*- coding: utf-8 -*-
 # @Time    : 2018-06-01 13:40
 # @Author  : 超人
 # @Email   : huxiaojiu111@gmail.com
 # @File    : 简单实现多级菜单功能 (输入s返回首菜单,输入b返回上一菜单,输入o终止程序)
 # @Software: PyCharm

 current_layer = menu#字典,多级菜单
 parent_layers=[]
 while True:
     for key in current_layer:
         print(key)
     choice = input('>>>>>>>>>>>').strip()
     if len(choice) == 0: continue
     if choice in current_layer:
         # print(choice)
         parent_layers.append(current_layer)
         current_layer = current_layer[choice]
     elif choice == "b":
         if not len(parent_layers)==0:
             current_layer = parent_layers.pop()
         else:
             current_layer=menu
     elif choice =="s":
         current_layer = menu
     elif choice == "o":
         break
     else:
         print('没有此选项,重新输入'.center(50,"-"))