[Python] Window instantly closes when program is run [closed]

I am using Pygame and pyopengl and i am following this tutorial

This is my code:

import pygame as pg
from OpenGL.GL import *

class App:
def __init__(self):
pg.init()
pg.display.set_mode((640,480), pg.OPENGL|pg.DOUBLEBUF)
self.clock=pg.time.Clock()

#OPENGL Init
glClearColor(0.1, 0.2,0.2, 1)

def mainLoop(self):
running=True
while running:
#Checks Events
for event in pg.event.get():
if (event.type == pg.QUIT):
running=False
#Refresh Screen
glClear(GL_COLOR_BUFFER_BIT)
pg.display.flip()

#Timing
self.clock.tick(60)

def quit(self):
pg.quit()


if __name__=="__main__":
myApp=App()


I dont get any errors just this:

pygame 2.6.1 (SDL 2.28.4, Python 3.9.0)
Hello from the pygame community. https://www.pygame.org/contribute.html
2025-07-23 11:27:54.865 Python[26556:1701460] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to /var/folders/rn/0lbm1p292jlddh1v_4468vw00000gn/T/org.python.python.savedState


I tried to make a window popup that is slightly black but a window pops up and closes instantly

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