Este código es para crear una animación andante. No sé qué está causando un error de atributo.

class player(pygame.sprite.Sprite):
    def init(self):
        pygame.sprite.Sprite.init(self)
        self.images = []
        for i in range(1, 5):
            img = pygame.image.load(os.path.join('Assets','Arts','xeonsheet','xeonsheet_' + str(i) + '.png'))
            self.images.append(img)
            self.images = self.images[0]
            self.images = self.images.get_rect

player = player()
player_list = pygame.sprite.Group()
player_list.add(player)

Traceback (most recent call last):
  File "C:/Users/User/PycharmProjects/Dreamwind-Chronicles/main.py", line 121, in <module>
    player = player()
  File "C:/Users/User/PycharmProjects/Dreamwind-Chronicles/main.py", line 117, in init
    self.images.append(img)
Attribute Error: 'builtin_function_or_method' object has no attribute 'append'

¿Cuál es el problema con el código?