pygame_minimal_sprite_group.py

# pygame.sprite module
# https://www.pygame.org/docs/ref/sprite.html
#
# What does pygame.sprite.Group() do
# https://stackoverflow.com/questions/68765971/what-does-pygame-sprite-group-do/68767767#68767767
#
# GitHub - Sprite, Group and Sprite mask - Sprite
# https://github.com/Rabbid76/PyGameExamplesAndAnswers/blob/master/documentation/pygame/pygame_sprite_and_sprite_mask.md

# https://replit.com/@Rabbid76/PyGame-Sprite

import pygame

class Player(pygame.sprite.Sprite):
    def __init__(self, center_pos):
        super().__init__() 
        self.image = pygame.Surface((40, 40))
        self.image.fill((255, 255, 0))
        self.rect = self.image.get_rect(center = center_pos)

class Bullet(pygame.sprite.Sprite):
    def __init__(self, center_pos):
        super().__init__() 
        self.image = pygame.Surface((20, 10))
        self.image.fill((0, 255, 255))
        self.rect = self.image.get_rect(center = center_pos)
    
    def update(self):
        self.rect.x += 10
        if self.rect.right > 300:
            self.kill()

pygame.init()
window = pygame.display.set_mode((400, 300))
clock = pygame.time.Clock()

player = Player((25, window.get_height() // 2))
all_sprites = pygame.sprite.Group(player)

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                all_sprites.add(Bullet(player.rect.center))

    all_sprites.update()
    print(len(all_sprites))

    window.fill('black')
    pygame.draw.rect(window, (255, 0, 0), (300, 0, 10, window.get_height()))
    all_sprites.draw(window)
    pygame.display.flip()

pygame.quit()
exit()