[Python] How can i scale up all my sprites in pygame?

I want to scale up the sprites i have in window surface. I'm using 16x16 sprites in 800x600 resolution and it look like this. Image

I try to using pygame.Surface then use .blit but the result is blank window before. Here is my code.

game.py
​

from scripts.settings import *
from scripts.level import Level

class Game:
def __init__(self):
pygame.init()
# Setup Window
self.screen = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption('Platformer')
self.clock = pygame.time.Clock()
self.running = True

self.tmx_maps = {0: load_pygame(join('data', 'map', 'world.tmx'))}


self.level = Level(self.tmx_maps[0])

def run(self):
while self.running: # Game Loop
# Delta time for frame independencies
dt = self.clock.tick(FPS) / 1000

for event in pygame.event.get():
if event.type == pygame.QUIT:
self.running = False
# Update

# Draw
self.level.run()
pygame.display.update()

pygame.quit()


if __name__ == '__main__':
game = Game()
game.run()

level.py
​

from scripts.settings import *
from scripts.sprites import Sprite

class Level:
def __init__(self, tmx_map):
self.screen = pygame.display.get_surface()

# Groups
self.all_sprites = pygame.sprite.Group()


self.setup(tmx_map)

def setup(self, tmx_map):
for x, y, surf in tmx_map.get_layer_by_name('Terrain').tiles():
Sprite(surf, (x * TILE_SIZE, y * TILE_SIZE), self.all_sprites)


def run(self):
self.screen.fill('light blue')
self.all_sprites.draw(self.screen)

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