python作业5：多级菜单

# 作业5：多级菜单#   ● 三级菜单，省、市、县、公司，要求程序启动后，允许用户依次选择进入各子菜单#   ● 可以在任意一级菜单返回上级菜单，也可以退出程序#   ● 所需新知识点：列表、字典## 思路：# 先创字典，字典三层嵌套#逐层提取key字段，#先不管各种可能，把主程序写好，即各种选择都是好好的情况下能实现的功能，再补充各种可能#这个地方其实是重点考察while循环里面的continue和break#出于程序简化，没有考虑输入数字超范围、输入的不是数字、q、b三者以外的情况

dict1 ={
        "省1":{
            "市11":{
                "县111":{
                    "公司1111:{}",
                    "公司1112:{}"
                },
                "县112":{
                    "公司1121:{}",
                    "公司1122:{}"
                }
            },
            "市12":{
                "县121":{
                    "公司1211:{}",
                    "公司1212:{}"
                },
                "县122":{
                    "公司1221:{}",
                    "公司1222:{}"
                }
            },
            "市13":{
                "县131":{},"县132":{}
            }
        },
        "省2":{
            "市21":{
                "县211":{},"县212":{}
            },
            "市22":{
                "县221":{},"县222":{}
            },
            "市23":{
                "县231":{},"县232":{}
            }
        },
        "省3":{
            "市31":{
                "县311":{},"县312":{}
            },
            "市32":{
                "县321":{},"县222":{}
            },
            "市33":{
                "县331":{},"县332":{}
            }
        }
}

judge = True

while judge:
    list1 = list(dict1.keys())
    list1.sort()
    print("The level_1 menu:")
    for index,item in enumerate(list1):
        print(index,item)
    choice1 = input("Please choose level_1:")
    if choice1.isdigit():
        choice1 = int(choice1)
        choice_key1 = list1[choice1]
        list2 = list(dict1.get(choice_key1))
        list2.sort()
        while judge:
            print("The level_2 menu:")
            for index, item in enumerate(list2):
                print(index, item)
            choice2 = input("Please choose level_2:")
            if choice2.isdigit():
                choice2 = int(choice2)
                choice_key2 = list2[choice2]
                list3 = list(dict1.get(choice_key1).get(choice_key2))
                list3.sort()
                while judge:
                    print("The level_3 menu:")
                    for index, item in enumerate(list3):
                        print(index, item)
                    choice3 = input("Please choose level_3:")
                    if choice3.isdigit():
                        choice3 = int(choice3)
                        choice_key3 = list3[choice3]
                        list4 = list(dict1.get(choice_key1).get(choice_key2).get(choice_key3))
                        list4.sort()
                        print("The level_4 menu:")
                        for index, item in enumerate(list4):
                            print(index, item)
                        choice4 = input("It‘s the last level,Please come back:")
                        if choice4 == "q":
                            # 判断位置空后，可以连续跳出多个循环
                            judge = False
                            # 这里是跳出了本while循环的所有循环
                            break
                        elif choice4 == "b":
                            # 这里只是跳出了本while循环中的一次循环
                            continue
                    elif choice3 == "q":
                        judge = False
                        break
                    elif choice3 == "b":
                        break
            elif choice2 == "q":
                judge = False
                break
            elif choice2 == "b":
                break
    elif choice1 == "q" :#是q退出
        judge = False
    else:#不是q也不是数字，重新选
        print("Please choose the number.")

原文地址：https://www.cnblogs.com/welljoy/p/8274136.html