This is from a python pygame tutorial. Why is my .x have attribute error and how to fix?

I am getting an error for the bullets. I want the bullets to move across the x axis when fired. bullet.x is getting ~ AttributeError: ‘list’ object has no attribute ‘x’. This is occurring in my function that handle_bullet. It should be bullet.x += BULLET_SPEED. This is when I fire from the player.

def draw_window(red,yellow, red_bullets, yellow_bullets,red_health,yellow_health):
    screen.blit(SPACE_BACKGROUND,(0,0))
    pygame.draw.rect(screen,BLACK,BORDER )
    # 
    red_health_text = HEALTH_FONT.render('Health: '+str(red_health),1,WHITE)
    screen.blit(red_health_text, (WIDTH-red_health_text.get_width()-10,10))
    # 
    yellow_health_text = HEALTH_FONT.render('Health: '+str(yellow_health),1,WHITE)
    screen.blit(yellow_health_text, (10,10))
    # yellow.x/y target the RECT creation in the Main function as starting points
    screen.blit(YELLOW_SPACESHIP,(yellow.x,yellow.y))
    screen.blit(RED_SPACESHIP,(red.x,red.y))

    for bullet in red_bullets:
        pygame.draw.rect(screen, RED, bullet)
        # 
    for bullet in yellow_bullets:
        pygame.draw.rect(screen,YELLOW,bullet)

    pygame.display.update()
# 
# 
# 
class Movement:
    def yellow_movement(keys_pressed, yellow):
        # Targets the key pressed and the box they can not go passed
        if keys_pressed[pygame.K_a] and yellow.x - 5 > 0:
            yellow.x -= 5
        elif keys_pressed[pygame.K_d] and yellow.x + 5 + yellow.width < BORDER.x:
            yellow.x += 5
        elif keys_pressed[pygame.K_w] and yellow.y - 5 > 0:
            yellow.y += -5
        elif keys_pressed[pygame.K_s] and yellow.y + 5 + yellow.height < HEIGHT:
            yellow.y += 5
    # 
    def red_movement(keys_pressed, red):
        if keys_pressed[pygame.K_LEFT] and red.x - 5 > BORDER.x:
            red.x -= 5
        elif keys_pressed[pygame.K_RIGHT] and red.x + 5 + red.width < WIDTH:
            red.x += 5
        elif keys_pressed[pygame.K_UP] and red.y - 5 > 0:
            red.y += -5
        elif keys_pressed[pygame.K_DOWN] and red.y + 5 + red.height < HEIGHT:
            red.y += 5
movement = Movement
# 
# 
# 
def handle_bullets(yellow_bullets,red_bullets,yellow,red):
    for bullet in yellow_bullets:
        bullet.x += BULLET_SPEED
        if red.colliderect(bullet):
            pygame.event.post(pygame.event.Event(RED_HIT))
            yellow_bullets.remove(bullet)
        elif bullet.x > WIDTH:
            yellow_bullets.remove(bullet)

    for bullet in red_bullets:
        bullet.x -= BULLET_SPEED
        if yellow.colliderect(bullet):
            pygame.event.post(pygame.event.Event(YELLOW_HIT))
            red_bullets.remove(bullet)
        elif bullet.x < 0:
            red_bullets.remove(bullet)
# 
# 
# 
def draw_winner(text):
    draw_text = WINNER_FONT.render(text,1,WHITE)
    screen.blit(draw_text, (WIDTH//2 - draw_text.get_width()/2,HEIGHT/2 - draw_text.get_height()/2))
    pygame.display.update()
    pygame.time.delay(5000)
# 
# 
# 
# Main game loop
def main():
    red = pygame.Rect(700,300,50,50)
    yellow = pygame.Rect(100,300,50,50)
    # 
    red_bullets = []
    yellow_bullets = []
    # 
    red_health = 10
    yellow_health = 10
    # 
    clock = pygame.time.Clock()
    run = True
    while run:
        clock.tick(FPS)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
                pygame.quit()
                exit()
        
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LSHIFT and len(yellow_bullets)<MAX_BULLETS:
                    bullet = pygame.Rect(yellow.x + yellow.width, yellow.y +yellow.height//2 - 2, 10,5)
                    yellow_bullets.append(yellow_bullets)

                if event.key == pygame.K_RSHIFT and len(red_bullets)< MAX_BULLETS:
                    bullet = pygame.Rect(red.x , red.y + red.height//2 - 2, 10,5)
                    red_bullets.append(red_bullets)
                    
            if event.type == RED_HIT:
                red_health -= 1

            if event.type ==YELLOW_HIT:
                yellow_health -= 1

        winner_text = ''
        if red_health <=0:
            winner_text = 'Yellow Wins!'

        if yellow_health <=0:
            winner_text = 'Red Wins!'

        if winner_text != '':
            draw_winner(winner_text)
            break

        # Listening for the key pressed event below:
        keys_pressed = pygame.key.get_pressed()
        movement.yellow_movement(keys_pressed,yellow)
        movement.red_movement(keys_pressed,red)
        # 
        handle_bullets(yellow_bullets,red_bullets,yellow,red)
        # calls the draw function to draw in main game loop
        draw_window(red,yellow,red_bullets,yellow_bullets,red_health,yellow_health)
    # Continues the game until closed
    main()
    # pygame.quit()
        
# Will only run the code if we are in the main file of the game
if __name__ == '__main__':
    main()

pygame.display.update()

>Solution :

I think you have not added the bullet correctly to the list. You actually append a list to the bullet list

yellow_bullets.append(yellow_bullets)

Thus, when you write bullet.x you are calling a list which does not have that atribute.

UPDATE

I think to fix the error you need to write

yellow_bullets.append(bullet)

as this will make it append the rectangle class to the list allowing you to call bullet.x