Python pygame 需要帮助同时禁用多个按键

我创建了一个Frogger游戏原型和我不想允许同时按下两个键进行移动。目前在我的事件函数中我有以下内容：

for event in pygame.event.get():
        # check for closing window
        if event.type == pygame.QUIT:
            if self.playing:
                self.playing = False
            self.running = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                self.player.speedx = -48
            if event.key == pygame.K_RIGHT:
                self.player.speedx = 48
            if event.key == pygame.K_UP:
                self.player.speedy = -48
            if event.key == pygame.K_DOWN:
                self.player.speedy = 48

            
    if event.type == pygame.KEYUP:
        if event.key == pygame.K_LEFT:
            self.player.speedx = 0
            self.player.speedy = 0
        if event.key == pygame.K_RIGHT:
            self.player.speedx = 0
            self.player.speedy = 0
        if event.key == pygame.K_UP:
            self.player.speedx = 0
            self.player.speedy = 0
        if event.key == pygame.K_DOWN:
            self.player.speedx = 0
            self.player.speedy = 0
                
    self.player.rect.x += self.player.speedx
    self.player.rect.y += self.player.speedy

这允许用户向左、向右、向上和向下移动。虽然我不希望用户能够同时按下两个键，例如：向左、向上或向右、向上，但它运行正常。还想排除其他方向，例如：左、下或右、下。基本上我希望用户一次只能朝一个方向行进。另外，有没有办法在按键之间设置时间限制？例如，在 1000 毫秒过去之前，您无法再次按下某个键。

您所要做的就是评估按下某个键时速度为 0：

for event in pygame.event.get():
        # check for closing window
        if event.type == pygame.QUIT:
            if self.playing:
                self.playing = False
            self.running = False
        if event.type == pygame.KEYDOWN:

            if self.player.speedx == 0 and self.player.speedy == 0:
                if event.key == pygame.K_LEFT:
                    self.player.speedx = -48
                if event.key == pygame.K_RIGHT:
                    self.player.speedx = 48
                if event.key == pygame.K_UP:
                    self.player.speedy = -48
                if event.key == pygame.K_DOWN:
                    self.player.speedy = 48
            # [...]

另一种选择是按下 a 键时重置速度：

for event in pygame.event.get():
        # check for closing window
        if event.type == pygame.QUIT:
            if self.playing:
                self.playing = False
            self.running = False
        if event.type == pygame.KEYDOWN:
   
         if event.key == pygame.K_LEFT:
                self.player.speedx = -48
                self.player.speedy = 0
            if event.key == pygame.K_RIGHT:
                self.player.speedx = 48
                self.player.speedy = 0
            if event.key == pygame.K_UP:
                self.player.speedx = 0
                self.player.speedy = -48
            if event.key == pygame.K_DOWN:
                self.player.speedx = 0
                self.player.speedy = 48

两种实现的行为不同。虽然第一个实现不允许您在按下按键时更改方向，但第二个实现会立即更改方向。尝试两种方法并选择适合您需求的一种。