Python 嵌套 while 循环问题

Question

我对编码比较陌生，我正在做一个项目，我制作一个类似于战舰的游戏，例如2 个玩家将 10 艘船放在 'board' 上，我为每个玩家制作了一个二维数组，其中 0 = 没有船，1 = 船。我这样做是为了让第一个玩家必须从 0-7 输入每艘船的 x 和 y 值，如果他们不从 0-7 输入它，它就在一个 while 循环中，所以它一直要求他们输入一个值0-7。我还想这样做，如果一组坐标上已经有一艘船，那么它会要求玩家输入一组新的坐标。但是，我在使用嵌套 while 循环时遇到了问题。

问题：

当我运行输入两个相同的坐标时，它会重复“你已经在这里放置了一个坦克。请输入另一组坐标。”。我认为当它运行通过外部循环时，它也可能跳过内部 while 循环？

p1Board = [[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0]]
flag3 = True
flag4 = True
var1 = True

#Player 1 Tank 2 
while var1 == True:
  while flag3 == True:
    p1XCoordTank2 = int(input("\nOn which x-coordinate would you like to place your second tank? "))
    flag3 = False
    if p1XCoordTank2 < 0 or p1XCoordTank2 > 7:
      print("Please choose an x-coordinate that is in the range 0-7. ")
      flag3 = True
  while flag4 == True:
    p1YCoordTank2 = int(input("On which y-coordinate would you like to place your second tank? "))
    flag4 = False
    if p1YCoordTank2 < 0 or p1YCoordTank2 > 7:
      print("Please choose an y-coordinate that is in the range 0-7. ")
      flag4 = True
  if p1Board[p1XCoordTank2][p1YCoordTank2] == 1:
    print("You already have a tank placed here. Please input another set of coordinates. ")
    var1 = True

不确定如何修复它。请帮帮我。

Answer 1

我无法重现您的错误信息：

You already have a tank placed here. Please input another set of coordinates.

在输入相同坐标时打印（f.e。p1XCoordTank2 = 0，p1YCoordTank2 = 0）。

但是，要阻止您从运行开始循环，您必须在某处将 var1 设置为 False：

flag3 = True
flag4 = True
var1 = True

#Player 1 Tank 2 
while var1 == True:
  while flag3 == True:
    p1XCoordTank2 = int(input("\nOn which x-coordinate would you like to place your second tank? "))
    flag3 = False
    if p1XCoordTank2 < 0 or p1XCoordTank2 > 7:
      print("Please choose an x-coordinate that is in the range 0-7. ")
      flag3 = True
  while flag4 == True:
    p1YCoordTank2 = int(input("On which y-coordinate would you like to place your second tank? "))
    flag4 = False
    if p1YCoordTank2 < 0 or p1YCoordTank2 > 7:
      print("Please choose an y-coordinate that is in the range 0-7. ")
      flag4 = True
  if p1Board[p1XCoordTank2][p1YCoordTank2] == 1:
    print("You already have a tank placed here. Please input another set of coordinates. ")
    var1 = True
  else:
    p1Board[p1XCoordTank2][p1YCoordTank2] = 1 #place the tank
    var1 = False #stop the while loop

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