#The Loop
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
    #key detection
    if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                car1.x_change = -5
            elif event.key == pygame.K_RIGHT:
                car1.x_change = 5
    if event.type == pygame.KEYUP:
        if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
            car1.x_change = 0