list.append takes exactly one argument (gived 2)

I am doing a little game, I am new at programming so i wanna start somehow so i have got a game and i want to add animation when you are walking. But i am not able to use more images it is showing me this error. and if you will be open to give me advise for using animation it would be great. I have this (in the important section):

    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.images = []
        for i in range(1, 5):
            mich = pygame.image.load(os.path.join('images', r'C:/users/filip/documents/rozsireni/Jumpi'
                                                            r'ng 6.png')).convert()
            mich2 = pygame.image.load(os.path.join('images', r'C:/users/filip/documents/rozsireni/Jumpi'
                                                             r'ng 7.png')).convert()
            mich = pygame.transform.scale(mich, (100, 100))
            mich2 = pygame.transform.scale(mich2, (100, 100))
            mich.convert_alpha()
            mich.set_colorkey(ALPHA)
            mich2.convert_alpha()
            mich2.set_colorkey(ALPHA)
            self.images.append(mich, mich2)
            self.image = self.images[0]
            self.rect = self.image.get_rect()


player = Player()
player.rect.x = 300
player.rect.y = 300
player_list = pygame.sprite.Group()
player_list.add(player)

Answer

The issue is with list.append

self.images.append(mich, mich2)

You can only append one element at a time, use list.extend([...]) instead if you want to append several elements.