Calling class methods inside main game loop

Question

im trying to learn pygame by creating a pong game and defining methods for movement in a 'Paddle' class, how can i call that method in my game loop so the paddles' position is updated when the associtaed keys (s,w,up arrow, down arrow)

class Paddle:
    def __init__(self, x, y, width, heigth) -> None:
        self.x = x
        self.y = y
        self.width = width
        self.height = heigth

    def draw(self, win):
        pygame.draw.rect(win, WHITE, (
            self.x, self.y, self.width, self.height
        ))

    def move_up(self):
        self.y - 10

    def move_down(self):
        self.y + 10

game loop:

def main():
    run = True
    clock = pygame.time.Clock()

    left_paddle = Paddle(10, HEIGHT // 2 - PADDLE_HEIGHT // 2, PADDLE_WIDTH, PADDLE_HEIGHT)
    right_paddle = Paddle(WIDTH - 10 - PADDLE_WIDTH, HEIGHT // 2 - PADDLE_HEIGHT // 2, PADDLE_WIDTH, PADDLE_HEIGHT)

    while(run):
        clock.tick(FPS)
        draw(WIN, [left_paddle, right_paddle])

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
                break
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    run = False

        keys = pygame.key.get_pressed()
        
        #this is part of my attempts to accomplish movement, didnt work
        for key in keys:
            if key == pygame.K_w:
                left_paddle.move_up
            if key == pygame.K_s:
                left_paddle.move_down
            if key == pygame.K_UP:
                right_paddle.move_up
            if key == pygame.K_DOWN:
                right_paddle.move_down
        

    pygame.quit()

Answer 1

You got it almost correct.left_paddle.move_up returns the method 'move_up' but it does not call it. Just add () to call the method instead:

        for key in keys:
            if key == pygame.K_w:
                left_paddle.move_up()
            if key == pygame.K_s:
                left_paddle.move_down()
            if key == pygame.K_UP:
                right_paddle.move_up()
            if key == pygame.K_DOWN:
                right_paddle.move_down()

Answer 2

While calling the functions adding the parenthesis was needed, the main issue was that I was trying to check if the keys were pressed inside a for loop iterating over the 'keys' map. I don't exactly why it didn't work at all but the gist is that after getting the list instead of iterating over it I just checked for specific key inside keys and then called the appropriate methods.

keys = pygame.key.get_pressed()
        
        if keys[pygame.K_w]:
            left_paddle.move_up()
        if keys[pygame.K_s]:
            left_paddle.move_down()
        if keys[pygame.K_y]:
            right_paddle.move_up()
        if keys[pygame.K_h]:
            right_paddle.move_down()