[Python] pygame, screen not updating or filling with correct color

Trying to start a new pygame project. Very basic stuff. Just trying to color the screen. Currently the screen opens, and goes white. There are no errors in the console. here is my code:

import sys

import pygame
from settings import Settings

def run_game():
pygame.init()
ai_settings = Settings()
screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
pygame.display.set_caption("Alien Invasion")

while True:

screen.fill((0,255,0))
for event in pygame.event.get():

if event.type == pygame.QUIT:
sys.exit()
pygame.display.flip() # same result with .update

run_game()



id be happy if it would simply show a green screen. Any ideas what my issue could be?

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