How to make fighting game command inputs in PyGame

Question

I am currently making a fighting game and was wondering how command inputs could be added. I understand it is kind of irrelevant and many substitutes are possible, but it would be nice to use familiar fighting game inputs.

I currently have something like this:

        keys = pygame.key.get_pressed()
        if keys[pygame.K_DOWN]:
            commandcount +=1
            if commandcount > 0 and commandcount < 30 and keys[pygame.K_RIGHT] and keys[pygame.K_z]:               
                player1.projectile = True

The "commandcount" helps keep the window of action available until a certain amount of time.

The main problem with this is that you could still press the inputs in whatever order and the projectile would still come out.

Thanks