三级菜单

字典文件：

#!/usr/bin/env python
# _*_coding:utf-8_*_
'''''
* Created on 2016/10/16 19:37.
* @author: Chinge_Yang.
'''
menu = {
    "家用电器": {
        "电视": [
            "合资品牌电视",
            "国产品牌电视",
            "互联网品牌电视"
        ],
        "空调": [
            "壁挂式空调",
            "柜式空调",
            "中央空调",
            "空调配件"
        ],
        "洗衣机": [
            "滚筒洗衣机",
            "洗烘一体机",
            "波轮洗衣机",
            "迷你洗衣机",
            "洗衣机配件"
        ]
    },
    "电脑": {
            "电脑整机": [
                "笔记本",
                "游戏本"    
                "平板电脑",
                "平板电脑配件",
                "台式机",
                "一体机服务器",
                "笔记本配件"
            ],
            "电脑配件": [
                "显示器",
                "CPU",
                "主板",
                "硬盘",
                "内存"
            ],
            "外设产品": [
                "鼠标",
                "键盘",
                "键鼠套装",
                "网络仪表仪器",
                "U盘",
                "移动硬盘"
            ]
        }
    }

主程序

# _*_coding:utf-8_*_
#author: tanxin

import  menu
import sys
dic1 = menu.menu.keys()
dict1 = {}
print(dic1)
for i,v in enumerate(dic1,0):
    print(i,"---> " +v)
    dict1[i] = v
#print(dict1)
print("输入【back】：返回；【quit】：退出")
select1 = input("请输入你的选择:").strip()
while True:
    select1 = str(select1)
    if select1.isdigit():
        select1=int(select1)
        if 0 <= select1 < len(dic1):
            dic2=menu.menu[dict1[select1]].keys()
            dict2= {}
            for i2, v2 in enumerate(dic2, 0):
                print(i2, "---> " + v2)
                dict2[i2] = v2
            print("输入【back】：返回；【quit】：退出")
            select2 = input("请输入你的选择:").strip()
            select2 = str(select2)
            if select2.isdigit():
                select2 = int(select2)
                if 0 <= select2 < len(dic2):
                    #print(dict2)
                    dict3 = menu.menu[dict1[select1]][dict2[select2]]
                    print (dict3)
                    while True:
                        for k3 in dict3:
                            print (k3)
                        print("输入【back】：返回；【quit】：退出")
                        three_select = input("请输入你的选择:\n").strip()
                        if three_select == "back":
                            break
                        elif three_select == "quit":
                            sys.exit("----谢谢使用----")
                        continue
        else:
                if select1 == 'back':
                    break
                elif select1 == 'quit':
                    sys.exit()
                print("\033[31m请输入数字\033[0m")

    else:
        if select1 == 'back':
            break
        elif select1 == 'quit':
            sys.exit()
    print("请输入数字")