why does the image not move when the keys are pressed

Question

part of the code in the Gg class related to movement:

class Gg(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.image.load('gg.png')
        self.rect = self.image.get_rect()
        self.rect.center = (81, 239)
    def move(self):
        pressed_keys = pygame.key.get_pressed()
        if pressed_keys[K_UP]:
            self.rect.move_ip(0, speed_gg_up)
        if pressed_keys[K_DOWN]:
            self.rect.move_ip(0, speed_gg_down)    
G = Gg()
gg_sprites = pygame.sprite.Group()
gg_sprites.add(G)

this is part of the code in the game loop:

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
    screen.fill(GREY)
    for entity in gg_sprites:
        screen.blit(entity.image, entity.rect)
        entity.move
    FramePerSec.tick(FPS)
    gg_sprites.draw(screen)
    pygame.display.update()

I have an image, but when I press the up and/or down keys, the image does not move. the code does not issue errors. I don't understand what I'm doing wrong