menu = {
"深圳":{
"罗湖":{
"罗湖火车站": {},
"东门": {},
"国贸": {},
"布心": {},
},
"福田":{
"香蜜湖": {},
"华强北": {},
"华强南": {},
"市民中心": {},
},
"南山": {
"南山中心城": {},
"南头关": {},
"华侨城": {},
},
"宝安": {
"宝安中心": {},
"西乡": {},
"松岗": {},
},
"龙岗": {
"龙岗中心城": {},
"布吉": {},
"坂田": {},
},
},
"湖南":{
"长沙": {
"大学城区":{},
},
"衡阳":{
"衡阳":{
"火车站":{},
},
},
"郴州":{
"北湖区": {},
"苏仙区": {},
"东湖区": {},
},
},
"北京":{},
}
current_layer = menu
parent_layer = []
while True:
for key in current_layer:
print(key)
choice = input(">>>>:").strip()
if len(choice) == 0:continue
if choice in current_layer:
parent_layer.append(current_layer)
current_layer = current_layer[choice]
elif choice == "b":
current_layer = parent_layer.pop()
else:
print("NO")
