Python第一周作业--三级菜单【未完成】

暂时没想出来怎么把字典内容放入文本中再读出来，循环用的也多，以后再优化吧

三级菜单：

运行程序输出第一级菜单

选择一级菜单某项，输出二级菜单，同理输出三级菜单

菜单数据保存在文件中

让用户选择是否要退出

有返回上一级菜单的功能

menu.py 运行文件

#!/use/bin/env python
# -*- coding:utf-8 -*-
data =     {'河北':{
"石家庄":{"长安区":["oldboy","baidu","tencent"],"桥东区":["百事可乐","雪碧","芬达"]},
"邯郸":{ "丛台区":["新世纪","天鸿"]}},
'北京':{"西城区":{"宣武门":["锦江之星","汉庭","如家"],"广安门":["希尔顿","速8","7天"]}}}

while True:
for line in data:
print(line)
choice = input("选择进入1：")
if choice in data:
while True:
for line2 in data[choice]:
print("-->",line2)
choice2 = input("选择进入2：")
if choice2 in data[choice]:
while True:
for line3 in data[choice][choice2]:
print("---->",line3)
choice3 = input("选择进入3：")
if choice3 in data[choice][choice2]:
for line4 in data[choice][choice2][choice3]:
print(line4)
choice4 = input("最后一层，返回请按b，退出请按q：")
if choice4 == "b":
pass
elif choice4 == "q":
exit()
elif choice3 == "b":
break
elif choice3 == "q":
exit()
elif choice2 == "b":
break
elif choice2 == "q":
exit()