关于三级的菜单的尝试

{
    '安徽':{
        "马鞍山":{
            "秀山区":["地产","草地"],
            "雨山区":["代码","程序员"]
                 },
        "宣城":{
            "泾县":["小山","大山"],
            "和县":{"桃花","山区"},
            "郎溪县":{"地域","人文"},
                },
        "芜湖":{
        "芜湖县":["小吃","东西"],
        "无为县":["无畏","繁荣"]
        "南岭县":["梨花","杏花"]
        },
            },
    "上海":{
        "闵行":{},
        "浦东":{},
        "宝山":{}
          },
    '浙江':{
        "杭州":{},
        "绍兴":{},
        "义乌":{},
          },
}

以上是文件内容，保存为文本文档

 1 import sys
 2 
 3 with open("weizhi.txt") as file:
 4     f = file.read()
 5 data = eval(f)
 6 
 7 def list(): #展示第一层数据
 8     for key in data.keys():
 9         print(key)
10 
11 def choose_one(choose1):
12     while choose1 != 'q':
13         global one
14         one = choose1
15         if choose1 in data:
16             for key2 in data[one]:
17                 print(key2)
18             choose_two(input("输入第二级菜单"))
19             break
20         elif choose1 == "b":
21             print("这为一级菜单无法返回")
22             break
23         else:
24             error = input("你输入错误，请重新输入")
25             if error == "q":
26                 break
27             else:
28                 choose_one(error)
29     else:
30         sys.exit()
31 
32 
33 def choose_two(choose2):
34     while choose2 != 'q':
35         global two
36         two = choose2
37         if choose2 in data[one]:
38             for key3 in data[one][two].keys():
39                 print(key3)
40             choose_three(input("请输入第三级菜单"))
41             break
42         elif two == 'b':
43             choose_one(one)
44             break
45         else:
46             error = input("输入错误，重新输入")
47             if error == 'q':
48              #   sys.exit()
49                 break
50             elif error == 'b':
51                 choose_one()
52             else:
53                 choose_two(error)
54     else:
55         sys.exit()
56 
57 
58 def choose_three(choose3):
59     while choose3 != 'q':
60         global three
61         three = choose3
62         if three in data[one][two]:
63             for key4 in data[one][two][three]:
64                 print(key4)
65             choose_four(input("输入字母"))
66             break
67         elif three == 'b':
68             choose_two(two)
69             break
70         else:
71             error = input("重新输入")
72             if error == 'q':
73                 break
74             else:
75                 choose_three(error)
76     else:
77         sys.exit()
78 
79 
80 def choose_four(choose4):
81     if choose4 == 'b':
82         choose_three(three)
83     elif choose4 == 'q':
84         sys.exit()
85     else:
86         print("你输入错误： ")
87         think = input("是否想继续(y/n): ")
88         if think == 'y':
89             list()
90             choose1 = input("一级菜单: ")
91             choose_one(choose1)
92         else:
93             sys.exit()
94 
95 
96 print("q表示推出，b表示返回上一级菜单")
97 list()
98 choose_one(input("请输入一级菜单"))