Question

我目前正在研究用Python 3.5编写的Yahtzee游戏。我已经定义了一个函数，要求用户输入将要播放的人的姓名，然后再检查这是否正确。

def get_player_names():

   while True:
      print("Who are playing today? ")

      players = [str(x) for x in input().split()]

      n = len(players)

      if n == 1:
          for p in players:
              print("So", p, "is playing alone today.")

          choice = input("Is this correct?(y/n)\n")

          if choice == "y" or "Y":
              break
          elif choice == "n" or "N":
              continue
          else:
              print("You should enter either y/Y or n/N")
              continue

      elif n > 1:
          print("So today, ", n, " people are playing, and their names are: ")

          for p in players:
              print(p)

          choice = input("Is this correct?(y/n)\n")

          if choice == "y" or "Y":
              break
          elif choice == "n" or "N":
              continue
          else:
              print("You should enter either y/Y or n/N")
              continue

      else:
          print("Sorry, but at least one person has to participate")
          continue

  placeholder()


def placeholder():
  print("KTITENS")

get_player_names()

程序创建没有问题的玩家列表，以及当用户确认玩家的名字是正确的时，此时循环中断并调用下一个函数。（目前这只是打印KITTENS的功能。问题是，如果用户输入＆＃34; n＆＃34; /＆＃34; N＆＃34;或其他什么，我希望循环重复，但它而是打破了。

希望有人可以帮助我！如果这个问题重复，请道歉，但我找不到有关Python 3的类似问题。

Answer 1

问题是这些问题：

if choice == "y" or "Y":
    break
elif choice == "n" or "N":
    # Some stuff

应该是：

if choice == "y" or choice == "Y":
    break
elif choice == "n" or choice == "N":
    # Some stuff

实际上，or "Y"始终为真，因此始终会调用break。

您可以在python控制台中输入以下内容来检查：

>>> if 'randomstring': print('Yup, this is True')
Yup, this is True

Answer 2

更改

if choice == "y" or "Y":
          break
      elif choice == "n" or "N":
          continue

到

if choice == "y" or choice =="Y":
          break
      elif choice == "n" or choice =="N":
          continue

'Y'是非空字符串，因此bool('Y')始终为True

您可以在此处阅读Truth Value Testing

Python 3中While循环的问题 - 循环应该重复时中断

2 个答案: