def drawChess(self, x, y): painter = QPainter(self.chessboard) painter.setRenderHint(QPainter.Antialiasing, True) self.turn = 0 painter.setBrush(Qt.black) self.turn = 1 else: painter.setBrush(Qt.white) self.turn = 0 painter.drawEllipse(QPoint(40 + x * 40, 40 + y * 40), 18, 18) painter.end() self.update()这段代码有什么问题

这段代码中存在一个语法错误。缺少一个if语句的条件部分。可能应该是这样的：

def drawChess(self, x, y):
    painter = QPainter(self.chessboard)
    painter.setRenderHint(QPainter.Antialiasing, True)
    if self.turn == 0:
        painter.setBrush(Qt.black)
        self.turn = 1
    else:
        painter.setBrush(Qt.white)
        self.turn = 0
    painter.drawEllipse(QPoint(40 + x * 40, 40 + y * 40), 18, 18)
    painter.end()
    self.update()

这段代码的作用是在棋盘上绘制黑白两色的圆形棋子，每当绘制完一个棋子后，它会把 self.turn 的值从 0 改为 1，或从 1 改为 0，以便在下一次绘制时使用不同的颜色。