[Rhythmbox-devel] determine the name of the active Playlist

[sdfsdf sdfsd <subscribe-life tut by>]

Hi!
I know 
python and want to
 write a rhytmbox plugin.
I know 
how to choose a list of playlists but can not
 determine the active.

How to 
determine the name of the active Playlist ?

Thanks.

-- wistful