Python笔记(五)三级菜单

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Python笔记(五)三级菜单

学习完python的字典操作后，练习写了一下三级菜单的程序。

Code如下:

#3级菜单
data = {'北京':{'海淀':{'五道口':{'soho':{},'网易':{},'Google':{}},'中关村':{'爱奇艺':{},'汽车之家':{},'youku':{},},'上地':{'百度':{},}},'昌平':{'沙河':{'老男孩':{},'北航':{}},'天通苑':{},'回龙观':{}},'朝阳':{},'东城':{}},'上海':{},'湖北':{},'广东':{}
}
exit_flag = False#标志位,只要不为True,循环会一直执行
while not exit_flag:for i in data:#循环打印dataprint(i)choice = input("请输入>>>")if choice in data:#判断choice是否在data中while not exit_flag:for i2 in data[choice]:print(i2)choice2 = input("请输入>>>")if choice2 in data[choice]:while not exit_flag:for i3 in data[choice][choice2]:print(i3)choice3 = input("请输入>>>")if choice3 in data[choice][choice2]:for i4 in data[choice][choice2][choice3]:print(i4)choice4 = input("最后一层,请输入b返回或输入q结束>>>")if choice4 == 'b':pass#直接跳过,如果不加pass的话会报错elif choice4 == 'q':exit_flag = Trueelif choice3 == 'b':breakelif choice3 == 'q':exit_flag = Trueelif choice2 == 'b':breakelif choice2 == 'q':exit_flag = Trueelif choice == 'q':exit_flag = True