python3 练习题(多级菜单)

Posted 2021-02-15 YanYan

‘‘‘
多级菜单
需求:
1.现有省/市/县3级结构,要求程序启动后,允许用户可依次选择进入各子菜单
2.可在任意一级菜单返回上一级
3.可以在任意一级菜单退出程序
所需新知识点: 列表/字典
‘‘‘
#定义省/市/县3级结构
province_dict = {
    "山东": {
        "济南": ["平阴", "商河", "莱芜"],
        "济宁": ["金乡", "微山", "嘉祥"],
        "曲阜": ["南辛", "陵城", "防山"]
    },
    "北京": {
        "海淀": ["万寿路", "永定路", "中关村"],
        "昌平": ["回龙观", "南口", "沙河"],
        "朝阳": ["呼家楼", "三里屯", "双井"]
    },
    "上海": {
        "黄浦": ["南京东路", "外滩", "瑞金二路"],
        "徐汇": ["湖南路", "天平路", "枫林路"],
        "长宁": ["华阳路", "新华路", "江苏路"]
    },
}

Flag = True
while Flag:
    # 定义空省列表
    province_list = []

    #显示省信息(一级)
    for pIndex, province in enumerate(province_dict):
        print(pIndex, province)
        province_list.append(province)
    print("Q 退出")

    #提示省编号
    p_choice = input("请输入省编号: ").strip()
    if p_choice.isdigit():
        p_choice = int(p_choice)
        if p_choice >=0 and p_choice < len(province_list):
            #显示市信息(二级)
            while Flag:
                city_list = []
                for cIndex, city in enumerate(province_dict[province_list[p_choice]]):
                    print(cIndex, city)
                    city_list.append(city)
                print("B 返回上一级, Q 退出")

                #提示用户输入市编号
                c_choice = input("请输入市编号: ").strip()
                if c_choice.isdigit():
                    c_choice = int(c_choice)
                    if c_choice >= 0 and c_choice < len(city_list):
                        while Flag:
                            county_list = []
                            #显示县信息(三级)
                            for ind, county in enumerate(province_dict[province_list[p_choice]][city_list[c_choice]]):
                                print(ind, county)
                                county_list.append(county)
                            print("B 返回上一级, Q 退出")

                            #让用户选择县编号
                            cou_choice = input("请输入县编号: ").strip()
                            if cou_choice.isdigit():
                                cou_choice = int(cou_choice)
                                if cou_choice >=0 and cou_choice < len(county_list):
                                    while Flag:
                                        #显示县名称
                                        print(province_dict[province_list[p_choice]][city_list[c_choice]][cou_choice])
                                        print("B 返回上一级, Q 退出")

                                        #最后一级判断用户的输入
                                        last_choice = input("请输入B返回上一级 或 Q退出").strip()
                                        if last_choice.upper() == "B":
                                            break
                                        elif last_choice.upper() == "Q":
                                            Flag = False
                                        else:
                                            print("目前已是最后一层,请输入B返回上一级 或Q退出.")
                                else:
                                    print("输入有误,请输入正确的县编号.")
                            elif cou_choice.upper() == "B":
                                break
                            elif cou_choice.upper() == "Q":
                                Flag = False
                            else:
                                print("输入有误,请输入正确的县编号.")
                    else:
                        print("输入有误,请输入正确的市编号.")
                elif c_choice.upper() == "B":
                    break
                elif c_choice.upper() == "Q":
                    Flag = False
                else:
                    print("输入有误,请重新输入正确的市编号.")
        else:
            print("输入有误,请输入正确的省编号.")
    elif p_choice.upper() == "Q":
        Flag = False
    else:        print("输入有误,请重新输入正确的省编号.")