The fist step. A new window appeared.

main.py

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+# this allows us to use code from
+# the open-source pygame library
+# throughout this file
+import pygame
+from constants import *
+
+def main():
+    print("Starting Asteroids!")
+    print(f"Screen width: {SCREEN_WIDTH}")
+    print(f"Screen height: {SCREEN_HEIGHT}")
+    pygame.init()
+
+    #set screen resolution
+    screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
+
+    while True:
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                 return
+
+        screen.fill((0,0,0))
+        pygame.display.flip()
+
+if __name__ == "__main__":
+    main()