Remove undefined variable

Update math_test.py

Somehow more formatting?

alr, this is buggy

What is happening?

Author: Matiiss

examples/aliens.py

@@ -314,15 +314,13 @@ def main(winstyle=0):
                         print("Changing to FULLSCREEN")
                         screen_backup = screen.copy()
                         screen = pygame.display.set_mode(
-                            SCREENRECT.size, winstyle | pygame.FULLSCREEN, bestdepth
+                            SCREENRECT.size, winstyle | pygame.FULLSCREEN
                         )
                         screen.blit(screen_backup, (0, 0))
                     else:
                         print("Changing to windowed mode")
                         screen_backup = screen.copy()
-                        screen = pygame.display.set_mode(
-                            SCREENRECT.size, winstyle, bestdepth
-                        )
+                        screen = pygame.display.set_mode(SCREENRECT.size, winstyle)
                         screen.blit(screen_backup, (0, 0))
                     pygame.display.flip()
                     fullscreen = not fullscreen