列表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

为什么会这样，我怎样才能阻止它发生？我知道str不能添加到此列表中，但我不是在尝试添加整数吗

Answer 1

有两个问题：假设playerChoice是一个整数（它是一个字符串，必须使用int().*进行转换），并且使用==进行赋值。这是固定的：

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

*您可能会对来自Python 2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