四級菜單實現（Python）

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menu_dict = {
     ‘山東‘ : {
         ‘青島‘ : {
             ‘四方‘:{‘興隆路‘,‘平安路‘,‘杭州路‘},
             ‘黃島‘:{},
             ‘嶗山‘:{}
         },
         ‘濟南‘ : {
             ‘曆城‘:{},
             ‘槐蔭‘:{},
             ‘高新‘:{}
         },
     },
     ‘江蘇‘ : {
         ‘蘇州‘ : {
             ‘滄浪‘:{},
             ‘相城‘:{},
             ‘平江‘:{}
         },
         ‘南京‘ : {
             ‘白下‘:{},
             ‘秦淮‘:{},
             ‘浦口‘:{}
         }
     }
}

current_layer = menu_dict
parent_layers = []#把不同層級的字典儲存在列表中（列表中嵌套字典)[menu_dict,menu_dict[省]，。。。。],到最後一層的時候列表是下面這個樣子
#parent_layers[0]={‘山東‘: {‘青島‘: {‘四方‘: {‘杭州路‘, ‘興隆路‘, ‘平安路‘}, ‘黃島‘: {}, ‘嶗山‘: {}}, ‘濟南‘: {‘曆城‘: {}, ‘槐蔭‘: {}, ‘高新‘: {}}}, ‘江蘇‘: {‘蘇州‘: {‘滄浪‘: {}, ‘相城‘: {}, ‘平江‘: {}}, ‘南京‘: {‘白下‘: {}, ‘秦淮‘: {}, ‘浦口‘: {}}}}

#parent_layers[1]={‘青島‘: {‘四方‘: {‘杭州路‘, ‘興隆路‘, ‘平安路‘}, ‘黃島‘: {}, ‘嶗山‘: {}}, ‘濟南‘: {‘曆城‘: {}, ‘槐蔭‘: {}, ‘高新‘: {}}}

#parent_layers[2]={‘四方‘: {‘杭州路‘, ‘興隆路‘, ‘平安路‘}, ‘黃島‘: {}, ‘嶗山‘: {}}while True:

 for key in current_layer:
 print(key)
 choice = input(">>:").strip()
 if len(choice) == 0:
 continue
 if choice in current_layer:
 parent_layers.append(current_layer)

 current_layer = current_layer[choice]
 elif choice ==‘b‘:
 if parent_layers:
 current_layer = parent_layers.pop()
 else:
 print("無此項")

四級菜單實現（Python）