How to use the oauthenticator.OAuthenticator function in oauthenticator

class MWCallbackHandler(OAuthCallbackHandler):
    """
    Override OAuthCallbackHandler to take out state parameter handling.

    mwoauth doesn't seem to support it for now!
    """

    def check_arguments(self):
        pass

    def get_state_url(self):
        return None


class MWOAuthenticator(OAuthenticator):
    login_service = 'MediaWiki'
    login_handler = MWLoginHandler
    callback_handler = MWCallbackHandler

    mw_index_url = Unicode(
        os.environ.get('MW_INDEX_URL', 'https://meta.wikimedia.org/w/index.php'),
        config=True,
        help='Full path to index.php of the MW instance to use to log in'
    )

    executor_threads = Integer(12,
        help="""Number of executor threads.

        MediaWiki OAuth requests happen in this thread,
        so it is mostly waiting for network replies.
        """,

from oauthenticator import OAuthLoginHandler, OAuthenticator
from .CarinaOAuthClient import CarinaOAuthClient


class CarinaLoginHandler(OAuthLoginHandler, OAuth2Mixin):
    """
    Carina OAuth dance magic
    """

    _OAUTH_AUTHORIZE_URL = CarinaOAuthClient.CARINA_AUTHORIZE_URL
    _OAUTH_ACCESS_TOKEN_URL = CarinaOAuthClient.CARINA_TOKEN_URL

    scope = ['identity', 'read', 'write', 'execute']


class CarinaAuthenticator(OAuthenticator, LoggingConfigurable):
    """
    Authenticate users with their Carina account
    """

    # Configure the base OAuthenticator
    login_service = 'Carina'
    login_handler = CarinaLoginHandler

    _carina_client = None
    @property
    def carina_client(self):
        if self._carina_client is None:
            self._carina_client = CarinaOAuthClient(self.client_id, self.client_secret, self.oauth_callback_url)

        return self._carina_client