【www.bbyears.com--python】
要求:
打印省、市、县三级菜单
可返回上一级
可随时退出程序
版本1
# _author : Ahern Li # @_date : 2017/9/12 menu = { "浙江省":{ "杭州市":{ "余杭区":{"中泰":{},"临平":{}}, "西湖区":{"西湖":{},"留下":{}} }, "温州市":{ "苍南县":{"灵溪":{},"龙港":{}}, "瑞安县":{"安阳":{},"锦湖":{}} } }, "广东省":{ "广州市":{ "越秀区":{"人民路":{},"北京路":{}}, "荔湾区":{"沙面":{},"龙津":{}} }, "珠海市":{ "香洲区":{"拱北":{},"吉大":{}}, "金湾区":{"红旗镇":{},"平沙镇":{}} } } } # 返回标记 q_flag = True # 退出标记 Q_flag = True # 返回,退出标记出现False退出循环 while q_flag and Q_flag: # 遍历打印省份 for i in menu: print(i) province = input("请输入要查找的省份(Q,退出):").strip() if province in menu: while q_flag and Q_flag: for i in menu[province]: print(i) city = input("请输入要查找的市(q,返回 或 Q,退出):").strip() if city in menu[province]: while q_flag and Q_flag: for i in menu[province][city]: print(i) county = input("请输入要查找的区或县(q,返回 或 Q,退出):").strip() if county in menu[province][city]: while q_flag and Q_flag: for i in menu[province][city][county]: print(i) # 提示最后一页,输入格式 choice = input("最后一页! q,返回 或 Q,退出:").strip() if choice == "q": # 配合 else: q_flag = True 退出该层循环,返回上层循环 q_flag = False elif choice == "Q": # 退出大循环 Q_flag = False else: # 提示输入不合法 print("输入错误!") # 改回 q_flag 的值,实现只退出一层循环 else: q_flag = True elif county == "q": q_flag = False elif county == "Q": Q_flag = False else: print("输入错误!") else: q_flag = True elif city == "q": q_flag = False elif city == "Q": Q_flag = False else: print("输入错误!") else: q_flag = True elif province == "Q": Q_flag = False else: print("输入错误!")
版本2
# _author : Ahern Li # @_date : 2017/9/12 menu = { "浙江省":{ "杭州市":{ "余杭区":{"中泰":{},"临平":{}}, "西湖区":{"西湖":{},"留下":{}} }, "温州市":{ "苍南县":{"灵溪":{},"龙港":{}}, "瑞安县":{"安阳":{},"锦湖":{}} } }, "广东省":{ "广州市":{ "越秀区":{"人民路":{},"北京路":{}}, "荔湾区":{"沙面":{},"龙津":{}} }, "珠海市":{ "香洲区":{"拱北":{},"吉大":{}}, "金湾区":{"红旗镇":{},"平沙镇":{}} } } } current_layer = menu # 实现动态循环 parent_layer = [] # 保留所有父层,最后一个元素永远为父层 while True: print() # 仅为了打印美观 for i in current_layer: # 遍历打印地址 print(i) choice = input("请在下方输入查询地址\n>>>:").strip() if choice in current_layer: if current_layer[choice]: # 判断是否为末层 parent_layer.append(current_layer) # 进入子层前,添加当前层作为父层 current_layer = current_layer[choice] # 修改子层 else: print("当前是最后一页") elif choice == "": continue elif choice == "q": # 返回上层 if parent_layer: # 判断 parent_layer 是否为空 current_layer = parent_layer.pop() # 取出当前层父层 # 退出循环 elif choice == "Q": break else: print("输入错误!")