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According to the pygame documentation at
pygame provides a LayeredDirty group for sprites. This is handy for sprites that do not move around a lot and don't need to be redrawn every frame.
Sadly i am not able to understand how to change the layer of a LayeredDirty sprite after it's creation…
The only way to assign o layer to a sprite DirtyLayered sprite group is to watch the order of creating those sprites.
LayerdDirty works best with DirtySprites, a subclass of Sprites:
pygame.sprite.DirtySprite a more featureful subclass of Sprite with more attributes pygame.sprite.DirtySprite(*groups): return DirtySprite None Extra DirtySprite attributes with their default values: dirty = 1 if set to 1, it is repainted and then set to 0 again if set to 2 then it is always dirty ( repainted each frame, flag is not reset) 0 means that it is not dirty and therefor not repainted again blendmode = 0 its the special_flags argument of blit, blendmodes source_rect = None source rect to use, remember that it is relative to topleft (0,0) of self.image visible = 1 normally 1, if set to 0 it will not be repainted (you must set it dirty too to be erased from screen) layer = 0 (READONLY value, it is read when adding it to the LayeredRenderGroup, for details see doc of LayeredRenderGroup)
Also see schwarzweiss game for an example of how to use LayeredDirty sprite group.
~~DISQUS~~