代码效果比较：
很low的代码版本展示如下
1 menu ={ 2 "福建":{ 3 "福州":{ 4 "闽侯":{}, 5 "连江":{}, 6 "马尾":{} 7 }, 8 "厦门": { 9 "思明":{}, 10 "湖里": {}, 11 "集美": {} 12 }, 13 "泉州": { 14 "丰泽":{}, 15 "洛江": {}, 16 "泉港": {} 17 }, 18 19 }, 20 "上海":{ 21 "浦东":{ 22 "陆家嘴":{}, 23 "张江":{}, 24 "川沙":{} 25 }, 26 "静安": { 27 "静安寺":{}, 28 "南京西路":{} 29 }, 30 "宝山": { 31 "吴淞街道":{}, 32 "友谊街道": {}, 33 "张庙街道": {} 34 }, 35 36 }, 37 "广东":{ 38 "广州":{ 39 "白云区":{}, 40 "海珠区": {}, 41 "越秀区": {} 42 43 }, 44 "深圳": { 45 "南山区": {}, 46 "罗湖区": {}, 47 "宝安区": {} 48 }, 49 "汕头": { 50 "潮阳区": {}, 51 "潮安区": {}, 52 "澄海区": {} 53 }, 54 55 } 56 } 57 58 back_flag = False 59 exit_flag = False 60 while not back_flag and not exit_flag: 61 for key in menu: 62 print(key) 63 choice = input("请输入名称>>>: ").strip() 64 if choice in menu: 65 while not back_flag and not exit_flag:#让程序停留在第二层 66 for key2 in menu[choice]: 67 print(key2) 68 choice2 = input("第二次输入>>>: ").strip() 69 if choice2 == 'b': 70 back_flag = True 71 if choice2 in menu[choice]: 72 while not back_flag and not exit_flag: 73 for key3 in menu[choice][choice2]: 74 print(key3) 75 choice3 = input("第三次输入>>>: ").strip() 76 # if choice3 in menu[choice][choice2][choice3]: 77 # while not back_flag: 78 # for key4 in menu[choice][choice2][choice3]: 79 # print(key4) 80 print("没有更多了！") 81 if choice3 =='b': 82 back_flag = True 83 if choice3 =='q': 84 exit_flag = True 85 else: 86 back_flag = False 87 else: 88 back_flag = False
更新后代码版本：
1 menu ={ 2 "福建":{ 3 "福州":{ 4 "闽侯":{}, 5 "连江":{}, 6 "马尾":{} 7 }, 8 "厦门": { 9 "思明":{}, 10 "湖里": {}, 11 "集美": {} 12 }, 13 "泉州": { 14 "丰泽":{}, 15 "洛江": {}, 16 "泉港": {} 17 }, 18 19 }, 20 "上海":{ 21 "浦东":{ 22 "陆家嘴":{}, 23 "张江":{}, 24 "川沙":{} 25 }, 26 "静安": { 27 "静安寺":{}, 28 "南京西路":{} 29 }, 30 "宝山": { 31 "吴淞街道":{}, 32 "友谊街道": {}, 33 "张庙街道": {} 34 }, 35 36 }, 37 "广东":{ 38 "广州":{ 39 "白云区":{}, 40 "海珠区": {}, 41 "越秀区": {} 42 43 }, 44 "深圳": { 45 "南山区": {}, 46 "罗湖区": {}, 47 "宝安区": {} 48 }, 49 "汕头": { 50 "潮阳区": {}, 51 "潮安区": {}, 52 "澄海区": {} 53 }, 54 55 } 56 } 57 58 59 current_layer = menu 60 parent_layer =[] #新建空列表 61 flags = False 62 while not flags: 63 for key in current_layer: 64 print(key) 65 choice = input("请输入相应的名称【退出请输入q,返回上一层请输入b】>>>: ").strip() 66 if choice in current_layer: 67 parent_layer.append(current_layer)#将结果存入到列表中 68 current_layer = current_layer[choice] #改变至输入的结果 69 elif choice == 'b': 70 if parent_layer:#空白的列表的bool值：false 71 current_layer = parent_layer.pop() 72 elif choice == 'q': 73 flags = True 74 else: 75 print("查无此人")
亦或者是这样的：
1 menu ={ 2 "福建":{ 3 "福州":{ 4 "闽侯":{}, 5 "连江":{}, 6 "马尾":{} 7 }, 8 "厦门": { 9 "思明":{}, 10 "湖里": {}, 11 "集美": {} 12 }, 13 "泉州": { 14 "丰泽":{}, 15 "洛江": {}, 16 "泉港": {} 17 }, 18 19 }, 20 "上海":{ 21 "浦东":{ 22 "陆家嘴":{}, 23 "张江":{}, 24 "川沙":{} 25 }, 26 "静安": { 27 "静安寺":{}, 28 "南京西路":{} 29 }, 30 "宝山": { 31 "吴淞街道":{}, 32 "友谊街道": {}, 33 "张庙街道": {} 34 }, 35 36 }, 37 "广东":{ 38 "广州":{ 39 "白云区":{}, 40 "海珠区": {}, 41 "越秀区": {} 42 43 }, 44 "深圳": { 45 "南山区": {}, 46 "罗湖区": {}, 47 "宝安区": {} 48 }, 49 "汕头": { 50 "潮阳区": {}, 51 "潮安区": {}, 52 "澄海区": {} 53 }, 54 55 } 56 } 57 58 level = []#空列表 59 while True: 60 for key in menu: 61 print(key) 62 choice = input(">>>: ").strip() 63 if choice == 'b': 64 if len(level) == 0:break 65 menu = level[-1] 66 level.pop() 67 68 elif choice in menu: 69 level.append(menu) 70 menu = menu[choice] 71 else: 72 continue