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Python self-motion code

📁 Advanced Python Topics, question, Help, Error, Beginner

Why doesn't the shape move left in this code? How to loop the movement?

 

import pygame
pygame.init()
WIDTH = 500
HEIGHT = 500
FPS = 60
screen = pygame.display.set_mode((WIDTH, HEIGHT ))
clock = pygame.time.Clock()
BG = (72, 209, 204)
red = (255, 0, 0)
pl = pygame.Rect(0,0,50,50)
direct = True


while True:
    screen.fill(BG)
    pygame.draw.rect(screen,red,pl,8)
    if direct:
        if pl.y <= 450: # down
            pl.y += 3
        else:
            direct = False # stop

    else:
        if pl.x <= 450: # right