optools/gpg/kant/docs/REF.args.struct.txt

The __init__() function of kant.SigSession() takes a single argument: args.

it should be a dict, structured like this:

{'batch': False,
 'checklevel': None,
 'gpgdir': '/home/bts/.gnupg',
 'keys': 'EFD9413B17293AFDFE6EA6F1402A088DEDF104CB,admin@sysadministrivia.com',
 'keyservers': 'hkp://sks.mirror.square-r00t.net:11371,hkps://hkps.pool.sks-keyservers.net:443,http://pgp.mit.edu:80',
 'local': 'false',
 'msmtp_profile': None,
 'notify': True,
 'sigkey': '748231EBCBD808A14F5E85D28C004C2F93481F6B',
 'testkeyservers': False,
 'trustlevel': None}

The gpgdir, sigkey, and keyservers are set from system defaults in kant.parseArgs() if it's run interactively.
This *may* be reworked in the future to provide a mechanism for external calls to kant.SigSession() but for now,
it's up to you to provide all the data in the dict in the above format. 

It will then internally verify these items and do various conversions, so that self.args becomes this:
(Note that some keys, such as "local", are validated and converted to appropriate values later on
e.g. 'false' => False)

{'batch': False,
 'checklevel': None,
 'gpgdir': '/home/bts/.gnupg',
 'keys': ['EFD9413B17293AFDFE6EA6F1402A088DEDF104CB',
          'admin@sysadministrivia.com'],
 'keyservers': [{'port': [11371, ['tcp', 'udp']],
                 'proto': 'hkp',
                 'server': 'sks.mirror.square-r00t.net'},
                {'port': [443, ['tcp']],
                 'proto': 'hkps',
                 'server': 'hkps.pool.sks-keyservers.net'},
                {'port': [80, ['tcp']],
                 'proto': 'http',
                 'server': 'pgp.mit.edu'}],
 'local': 'false',
 'msmtp_profile': None,
 'notify': True,
 'rcpts': {'EFD9413B17293AFDFE6EA6F1402A088DEDF104CB': {'type': 'fpr'},
           'admin@sysadministrivia.com': {'type': 'email'}},
 'sigkey': '748231EBCBD808A14F5E85D28C004C2F93481F6B',
 'testkeyservers': False,
 'trustlevel': None}