I copied and pasted your code and it gives me this warning.

import math import pygame class MarbelSprite(pygame.sprite.Sprite): def _init_(self, x, ground, diameter, velocity, filename): pygame.sprite.Sprite._init_(self) try: self.image = pygame.transform.smoothscale(pygame.image.load(filename).convert_alpha(), (diameter, diameter)) except: self.image = pygame.Surface((diameter, diameter), pygame.SRCALPHA) pygame.draw.circle(self.image, (255, 128, 0), (diameter // 2, diameter // 2), diameter // 2) self.original_image = self.image self.rect = self.image.get_rect(midbottom = (x, ground)) self.diameter = diameter self.x = x self.velocity = velocity self.move_x = 0 self.follow = None self.angle = 0 def update(self, time, restriction): move_x = 0 prev_x = self.x if self.move_x != 0: move_x = self.move_x * self.velocity * time elif self.follow: dx = self.follow.rect.centerx - self.x move_x = (-1 if dx < 0 else 1) * min(self.velocity * time, abs(dx)) self.x += move_x self.x = max(restriction.left + self.diameter // 2, min(restriction.right - self.diameter // 2, self.x)) self.rect.centerx = round(self.x) self.angle -= (self.x - prev_x) / self.diameter * 180 / math.pi self.image = pygame.transform.rotate(self.original_image, self.angle) self.rect = self.image.get_rect(center = self.rect.center) pygame.init() window = pygame.display.set_mode((500, 300)) clock = pygame.time.Clock() ground_level = 220 object = MarbelSprite(window.get_rect().centerx, ground_level, 100, 0.4, 'BaskteBall64.png') follower = MarbelSprite(window.get_width() // 4, ground_level, 50, 0.2, 'TennisBall64.png') all_sprites = pygame.sprite.Group([object, follower]) run = True while run: time = clock.tick(60) for events in pygame.event.get(): if events.type == pygame.QUIT: run = False keys = pygame.key.get_pressed() object.move_x = keys[pygame.K_RIGHT] - keys[pygame.K_LEFT] follower.follow = object all_sprites.update(time, window.get_rect()) window.fill((32, 64, 224)) pygame.draw.rect(window, (80, 64, 64), (0, ground_level, window.get_width(), window.get_height()-ground_level)) all_sprites.draw(window) pygame.display.flip() pygame.quit() exit()

How does this happen??