Python surface error? Why?

[Trolkar8]

I have got a problem in my script. i am trying to make an rpg game(Yeah yeah i just started...). When i run the program and push any of the arrow keys i get an error. Why ?
The errors look like the followings

            elif event.key == pygame.K_DOWN:
                y = y - 20
                screen.blit(player[x, y])

   def Walk(self, x, y):
        pygame.draw.rect(screen, [0,255,0],[0, 0, 480, 640])
        self.image = pygame.image.load(player_images[self.angle])
        screen.blit(self.image[x, y])
        if self.angle == 0:
            y = y - 20
        elif self.angle == 1:
            x = x + 20
        elif self.angle == 2:
            y = y + 20
        elif self.angle == 3:
            x = x - 20
        pygame.display.flip()

The syntax error:

screen.blit(self.image[x, y])
TypeError: 'pygame.Surface' object is unsubscriptable
Script terminated.

[bvdet]

You received that error because self.image is not scriptable. A list or tuple is scriptable. It's possible an attribute of self.image is scriptable.