name = []
while True:
 print("="*50)
 print(" 歡迎進入名片管理系統(tǒng)V1.0")
 print("1：添加一個名片")
 print("2：修改一個名片")
 print("3：刪除一個名片")
 print("4：查詢一個名片")
 print("5：退出")
 print("="*50)
 admin = int(input("請輸入功能編號："))

 if admin == 1:
 while True:
  new_name = input("請輸入你的名字：")
  if new_name == "返回":
  break
  name.append(new_name)
  print("=======>添加成功！")
  print("=======>目前已添加的名字有：%s"%(name))
  print("=======>返回菜單請輸入：返回")
 elif admin == 2:
 while True:
  al_name = input("請輸入你要修改的名字：")
  if al_name == "返回":
  break
  if al_name in name:
  als_name = input("請輸入新名字：")
  name.remove(al_name)
  name.append(als_name)
  print("=======>目前的名字有：%s" % (name))
  else:
  print("您輸入的名字不存在，請重新輸入！")
  print("=======>返回菜單請輸入：返回")
 elif admin == 3:
 while True:
  del_name = input("請輸入你要刪除的名字：")
  if del_name == "返回":
  break
  name.remove(del_name)
  print("=======>刪除成功！")
  print("=======>目前已剩余的名字有：%s" % (name))
  print("=======>返回菜單請輸入：返回")
 elif admin == 4:
 while True:
  look_name = input("請輸入你要查詢的名字：")
  if look_name == "返回":
  break
  else:
  if look_name in name:
   print("你要查詢的名字存在！")
  else:
   print("查無此人！")
  print("=======>返回菜單請輸入：返回")
 elif admin == 5:
 break
 else:
 print("你的輸入有誤，請從新輸入！")