[Python] I’m having a problem in Pygame with displaying the sky [duplicate]

I'm making a platformer game, and I'm trying to create the world but the sky.png file doesn't show up. I tried with other PNG files, and it still doesn't work.

I inserted the location and coordinates, but instead of it appearing, it was just a black screen.

Here's my code:

import sys

import pygame

class Game:
def __init__(self):
pygame.init()

pygame.display.set_caption('Shadow samurai')
self.screen = pygame.display.set_mode((1200,800))

self.clock = pygame.time.Clock()

self.img = pygame.image.load('assets/sky.png')

self.img_pos = (160, 260)
self.movement = [False, False]

def run(self):
while True:
self.screen.blit(self.img, self.img_pos)

for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
self.movement[0] = True
if event.key == pygame.K_DOWN:
self.movement[1] = True
pygame.display.update()
self.clock.tick(60)

Game().run()

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