[Pythonmac-SIG] Adding a track to an iTunes playlist (appscript)

[David]

I'm trying to translate the following  applescript into python:

tell application "iTunes"
     tell source "Library"
         tell playlist "Library"
             ** a bunch of code for selecting a_track and a_playlist
             duplicate a_track to a_playlist
         end tell
     end tell
end tell

What I've tried is:
app('Itunes').sources['Library'].playlists['Library'].duplicate 
( a_track, to=a_playlist )

and many variations of it. But all I get is an error saying "Too many  
direct arguments".

Can anyone spot what I'm doing wrong?

Thanks in advance,
/David
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