返回已从函数追加的列表

Question

我有一个玩奥赛罗的棋盘（由一个列表列表代表）。游戏的重点是翻转对方玩家的棋子。

在这里，我试图记录板上可以翻转的位置。每个位置都由表示行和列的坐标表示。通常，输入是玩家棋子所在的棋盘位置，并且该功能正在检查有效的移动（定位相邻的相对棋子），并且输出应该是可以翻转相对棋子的位置列表。

但是，我的问题是我似乎无法将这些位置附加到列表中并返回它们。每次我尝试返回时，都会得到一个“ []”，这表示它什么也不做，或者无，这取决于我将缩进位置放在哪里。

奇怪为什么不存储坐标值。该功能的相关部分就在我要记录所有这些位置的“如果有效：”部分之后。

def findOppose(board, colorPlaying, colorAgainst, piece, row, col):
    ## find opposing pieces and turn them into colorPlaying
    valid = False
    opp = []
    pieces = [piece]
    try:
        if board[piece[0]+row][piece[1] + col] == colorAgainst:
            if (piece[1] + col == 0) or (piece[1] + col == 7) or (piece[0] + row == 0) or (piece[0] + row == 7):
                next
            else:
                piece[0], piece[1] = piece[0]+row, piece[1] + col
            ## check if there is colorPlaying surrounding these pieces otherwise would flip everything
                while board[piece[0]][piece[1]] != colorPlaying:
                    ## no surrounding colorPlaying piece
                    ## if black, example would be BWW. but need BWWB
                    if board[piece[0]+row][piece[1]+col] == " .":
                        break
                    ## reached boundaries of board
                    elif (piece[1] + col < 0) or (piece[1] + col > 7) or (piece[0] + row < 0) or (piece[0] + row > 7):
                        break
                    elif board[piece[0]][piece[1]] == colorPlaying:
                        valid = True
                        break
                    else:
                        board[piece[0]][piece[1]] = board[piece[0]+row][piece[1]+col]
            ## flip
                if valid:
                    while board[piece[0]][piece[1]] == colorAgainst:
                        ## there is an issue of directly changing here as the next findOppose() will
                        ## continue where the board is left off which means other pieces will change incorrectly
                            # board[piece[0]][piece[1]] = colorPlaying
                        if board[piece[0]][piece[1]] == colorAgainst:
                            opp_piece = piece[0],piece[1]
                            opp.append(opp_piece)  ## append to list of all opposing pieces
                        if board[piece[0]+row][piece[1] + col] == colorAgainst: ## keep progressing through
                            board[piece[0]][piece[1]] = board[piece[0]+row][piece[1]+col]
                        else:
                            break
    except IndexError:
        pass
    return opp