main.py

import pygame
import sys
from constants import *
from player import *
from asteroid import *
from asteroidfield import *
from bullet import *

def main():
    pygame.init()
    print("Starting Asteroids!")
    dt = 0
    updatable = pygame.sprite.Group()
    drawable = pygame.sprite.Group()
    asteroids = pygame.sprite.Group()
    shots = pygame.sprite.Group()
    Player.containers = (updatable, drawable)
    Asteroid.containers = (asteroids, updatable, drawable)
    AsteroidField.containers = (updatable, )
    Shot.containers = (shots, updatable, drawable)
    player = Player(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, shots)
    timing = pygame.time.Clock()
    asteroidfield = AsteroidField()
    # print(f"Screen width: {SCREEN_WIDTH}")
    # print(f"Screen height: {SCREEN_HEIGHT}")
    screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
    while True:
        for event in pygame.event.get():
             if event.type == pygame.QUIT:
                return
        updatable.update(dt)
        for asteroid in asteroids:
            if player.collisions(asteroid) == True:
                sys.exit("Game over!")
            for bullet in shots:
                if bullet.collisions(asteroid) == True:
                    bullet.kill()
                    asteroid.split(asteroids)                    
        screen.fill("black")
        for i in drawable:
            i.draw(screen)
        ticked = timing.tick(60)
        dt = ticked / 1000
        pygame.display.flip() # call this last, ALWAYS

if __name__ == "__main__":
    main()