all_sprites_list = pygame.sprite.Group()

bullets = []
bullet_list = pygame.sprite.Group()
bullet_speed = 10

class Bullet(pygame.sprite.Sprite):
def __init__(self):
    super().__init__()

    self.image = pygame.Surface([4,10])
    self.image.fill(red)
    self.rect = self.image.get_rect()


def update(self):
    if self.rect.x > chx:
        self.rect.x -= bullet_speed
    elif self.rect.x < chx:
        self.rect.x += bullet_speed
    if self.rect.y > chy:
        self.rect.y -= bullet_speed
    elif self.rect.y < chy:
        self.rect.y += bullet_speed

if event.type == pygame.MOUSEBUTTONDOWN:
        bullet = Bullet()
        if weapon == "hg" and hg_move == True:
            bullet.rect.x = hgrect.x
            bullet.rect.y = hgrect.y
            all_sprites_list.add(bullet)
            bullet_list.add(bullet)