一:制作要求

1.三级菜单　　2.可依次选择进入各子菜单　　3.所需新知识点:字典,列表

*本文通过三种方法完成,第一种:只使用循环,第二种:使用列表,第三种:使用字典

二:FlowChart流程图

与上图对应,实现方式图解:

while用来判断输入的数据和允许输入数据中的哪一项匹配,if来进行判断是否退出本次循环,

三:具体实现代码:

1.没有使用列表字典

msg=msg_1=msg_2_2=msg_2_1=select_input=input(select_input== select_input_1 = input(select_input_1 == select_input_2 = input(select_input_2==select_input_1 == select_input_2 = input(select_input_2 == select_input_1 == select_input_2 = input(select_input_2 == select_input_1== select_input == select_input_1 = input(select_input_1 == select_input_2 = input(select_input_2 == select_input_1 == select_input_2 = input(select_input_2 == select_input_1 == select_input_2 = input(