created PongBall class

pong.py

@@ -6,6 +6,16 @@
 
 import pygame, sys, random
 
+class PongBall(pygame.Rect):
+    def __init__(self, left, top, height, width):
+        super().__init__(left, top, height, width)
+
+    def set_center(self, x, y):
+        self.center = (x, y)
+
+
+
+
 def reset_ball():
     global ball_speed_x, ball_speed_y
     ball.x = screen_width/2 - 10
@@ -73,8 +83,8 @@ pygame.display.set_caption("My Pong Game!")
 
 clock = pygame.time.Clock()
 
-ball = pygame.Rect(0,0,30,30)
-ball.center = (screen_width/2, screen_height/2)
+ball = PongBall(0, 0, 30, 30)
+ball.set_center(screen_width/2, screen_height/2)
 
 cpu = pygame.Rect(0,0,20,100)
 cpu.centery = screen_height/2