PyGame rect.move movement not functioning properly
Solution 1:
pygame.Rect.move doesn't change the Rect object itself, but it returns an new Rect object (Probably the name of the method is misleading).
This means, that
self.rect.move(xy[0], xy[1])
doesn't change anything. You've to assign the rectangle which is returned by .move to "itself":
self.rect = self.rect.move(xy)
Alternatively you can use pygame.Rect.move_ip(), moves the rectangle "in place" and changes the Rect object:
self.rect.move_ip(xy[0], xy[1])