简化代码 for item in range(0, self.SIZE): pygame.draw.line(self.screen, GREY, [POS_START[0] + item * self.UNIT, POS_START[1]], [POS_START[0] + item * self.UNIT, POS_START[1] + self.SIZE * self.UNIT], 3) pygame.draw.rect(self.screen, BLACK, [self.BORDER_WIDTH, self.BORDER_WIDTH, self.UNIT * self.SIZE, self.UNIT * self.SIZE], 2)

可以简化为：

for item in range(self.SIZE):
    x = POS_START[0] + item * self.UNIT
    pygame.draw.line(self.screen, GREY, [x, POS_START[1]], [x, POS_START[1] + self.SIZE * self.UNIT], 3)
pygame.draw.rect(self.screen, BLACK, [self.BORDER_WIDTH, self.BORDER_WIDTH, self.UNIT * self.SIZE, self.UNIT * self.SIZE], 2)

将`range(0, self.SIZE)`简化为`range(self.SIZE)`，并将重复计算的表达式提取出来，可以使代码更加简洁易懂。