How do I figure out the disc numbers in a release result from py-musicbrainz2?

Question

The documentation for the Python musicbrainz2 library tells me that this is how I search for a release by disc id:

>>> import musicbrainz2.webservice as ws
>>> q = ws.Query()
>>> filter = ws.ReleaseFilter(discId='8jJklE258v6GofIqDIrE.c5ejBE-')
>>> results = q.getReleases(filter=filter)
>>> results[0].score
100
>>> results[0].release.title
u'Under the Pink'

But for a double CD I get the same release (as it should be) but different tracks when I search for the disc ID for the two CDs. This is also as it should be, but I don't see a way to get the disc number from the result of the query. Is it there somewhere? I think it is there in the XML, as a "medium".

Answer 1

The musicbrainz2 package, despite its name, seems to support only the deprecated version 1 of the web service's schema, which, as far as I could find, does not provide media information.

The solution seems to be to use instead, the musicbrainzngs package, which supports the MusicBrainz NGS web service (version 2). Then you just need to do something like the following (based on the example provided in the package's source):

>>> from pprint import pprint
>>> import musicbrainzngs
>>> musicbrainzngs.set_useragent("application", "0.01", "http://example.com")
>>> pprint(musicbrainzngs.get_release_by_id("e94757ff-2655-4690-b369-4012beba6114",["media"]))
{'release': {'barcode': '9421021463277',
             'country': 'NZ',
             'date': '2008-07-04',
             'id': 'e94757ff-2655-4690-b369-4012beba6114',
             'medium-list': [{'format': 'CD',
                              'position': '1',
                              'track-list': []}],
             'quality': 'normal',
             'status': 'Official',
             'text-representation': {'language': 'eng', 'script': 'Latn'},
             'title': 'Affordable Pop Music'}}

And voilà: medium-list information available!