def get_session(self, session_name):
    if session_name not in self._sessions:

      try:
        conf = self.config['sessions'][session_name]
      except KeyError:
        raise KitError('No session %r found' % (session_name, ))

      engine = create_engine(
        conf.get('url', 'sqlite://'), **conf.get('engine', {})
      )
      session = scoped_session(
        sessionmaker(bind=engine, **conf.get('kwargs', {}))
      )

      options = conf.get('options', {})
      options.setdefault('commit', False)
      options.setdefault('raise', True)

      self._sessions[session_name] = (session, options)
    return self._sessions[session_name][0]
SQLAlchemy session getter.
dataset/ETHPy150Open mtth/kit/kit/base.py/Kit.get_session