[pygame] move problems

[Yanom Mobis <yanom@xxxxxxxxxxxxxx>]

this code is in my main game loop

key = pygame.key.get_pressed() #create a key index
    
    if K_UP in key: #check if the up arrow is pressed
        redcar.speed = (0, -2)
    else:
        redcar.speed = (0, 0)

    redcar.rect = redcar.rect.move(redcar.speed) #move redcar by speed

but pressing the up arrow doesn't move the sprite.