name = []while True: print("="*50) print(" 歡迎進入名片管理系統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！")