Python pygame need help disabling multiple keypresses at once [duplicate]

Answer 1

All you have to do is evaluate that the speed is 0 when a key is pressed:

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
            # [...]

Another option is to reset the speed when the a key is pressed:

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

The two implementations behave differently. While the first implementation does not allow you to change direction while a key is pressed, the second implementation changes direction immediately. Try both and choose the one that suits your needs.