[python怎么读]Python三级菜单的实例

更新时间:2021-08-22    来源:python    手机版     字体:

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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!")

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