python - 列表出现类型错误的未知原因

Question

def player_move(Player, board):
    playerMarker = None
    print("Player ",Player," it is your turn!")
    playerChoice = input("Please input your move: ")
    if Player == 1:
        playerMarker == 9
    else:
        playerMarker == 10
    board[playerChoice] == playerMarker

这会产生类型错误:

line 36, in player_move
board[playerChoice] == playerMarker
TypeError: list indices must be integers or slices, not str

这是为什么，我怎样才能阻止这种情况发生？我知道 str 无法添加到此列表中，但我不是在尝试添加整数吗？

Answer 1

有两个问题:您假设 playerChoice 是一个整数(它是一个字符串，必须使用 int().* 进行转换)，并且您是使用 == 进行赋值。已修复:

def player_move(Player, board):
    playerMarker = None
    print("Player ",Player," it is your turn!")
    # should probably check for invalid inputs here
    playerChoice = int(input("Please input your move: "))
    if Player == 1:
        playerMarker = 9
    else:
        playerMarker = 10
    board[playerChoice] = playerMarker

* 你可能会因为来自 Python 2 而感到困惑，其中 input 确实(偶尔)返回一个整数； Python 3 的 input ≙ Python 2 的 raw_input。