Grab the VLC Python module, vlc.py, which provides full support for libVLC and pop that in site-packages. Then:
>>> import vlc
>>> p = vlc.MediaPlayer("file:///path/to/track.mp3")
>>> p.play()
And you can stop it with:
>>> p.stop()
That module offers plenty beyond that (like pretty much anything the VLC media player can do), but that's the simplest and most effective means of playing one MP3.
You could play with os.path a bit to get it to find the path to the MP3 for you, given the filename and possibly limiting the search directories.
Full documentation and pre-prepared modules are available here. Current versions are Python 3 compatible.
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