015_三级菜单练习

# __author__:Nzkalhbxx
# __date__:2017/10/15
menu = {
    '河北': {
        '石家庄': {
            '平山县': {},
            '新乐市': {},
            '辛集市': {}
        },
        '唐山': {
            '路南区': {},
            '开平区': {},
            '丰南区': {}
        },
        '邯郸': {
            '丛台区': {},
            '复兴区': {},
            '大名县': {}
        }
    },
    '湖北': {
        '武汉': {
            '江岸区': {},
            '江汉区': {},
            '武昌区': {}
        },
        '黄石': {
            '下陆区': {},
            '铁山区': {},
            '黄石港区': {}
        },
        '咸宁': {
            '嘉鱼县': {},
            '通城县': {},
            '崇阳县': {}
        }
    },
    '广东': {
        '广州': {
            '荔湾区': {},
            '天河区': {},
            '萝岗区': {}
        },
        '韶关': {
            '武江区': {},
            '曲江区': {},
            '浈江区': {}
        },
        '汕尾': {
            '陆河县': {},
            '陆丰市': {},
            '海丰县': {}
        }
    }
}
# loop_print_flag = True  # loop_print_flag用于标志是否循环输出当前等级菜单内的所有选项
# notBack_flag = True     # notBack_flag用于标志是否不返回上一层
# while loop_print_flag and notBack_flag:
#     for ele in menu:
#         print(ele)
#     province = input("选择地点>>>:").strip()
#     if province == "back":
#         notBack_flag = False    # 当输入为back时, 将notBack_flag设置为False
#     elif province in menu:
#         while loop_print_flag and notBack_flag:
#             for ele in menu[province]:
#                 print(ele)
#             city = input("选择地点>>>:").strip()
#             if city == "back":
#                 notBack_flag = False
#             elif city in menu[province]:
#                 while loop_print_flag and notBack_flag:
#                     for ele in menu[province][city]:
#                         print(ele)
#                     county = input("选择地点>>>:").strip()
#                     if county == "back":
#                         notBack_flag = False
#                     elif county in menu[province][city]:
#                         print(''.join(["-->", county]))
#                         lastChoice = input("是否选择完成:退出(quit)/回退(back):")
#                         if lastChoice == "quit":
#                              loop_print_flag = False
#                              notBack_flag = False
#                         elif lastChoice == "back":
#                             notBack_flag = False
#                 notBack_flag = True
#             else:
#                 loop_print_flag = True
#         notBack_flag = True
#     else:
#         loop_print_flag = True
# print("-------->退出选择<--------")


# 精简版
# loop_print_flag用于标志是否循环输出当前等级子菜单内的所有选项
loop_print_flag = True
# current_level用于保存当前循环所在菜单
current_level = menu
# 用于返回时使用, 每进入下一层时便保存上一级的目录菜单
parent_level = []
# 判断是否输入有误
errorInput = True
while loop_print_flag or errorInput:
    for ele in current_level:
        print(ele)
    choice = input("place is not exist, choose quit or back:>>>:").strip()
    if choice in current_level:
        parent_level.append(current_level)
        current_level = current_level[choice]
    elif choice == "back":
        if parent_level.__len__() > 0:
            current_level = parent_level.pop()
    elif choice == "quit":
        loop_print_flag = False
        errorInput = False
print("-------->退出选择<--------")