How to use the oauthenticator.azuread.AzureAdMixin function in oauthenticator

def azure_token_url_for(tentant):
    return 'https://login.microsoftonline.com/{0}/oauth2/token'.format(tentant)


def azure_authorize_url_for(tentant):
    return 'https://login.microsoftonline.com/{0}/oauth2/authorize'.format(
        tentant)


class AzureAdMixin(OAuth2Mixin):
    tenant_id = os.environ.get('AAD_TENANT_ID', '')
    _OAUTH_ACCESS_TOKEN_URL = azure_token_url_for(tenant_id)
    _OAUTH_AUTHORIZE_URL = azure_authorize_url_for(tenant_id)


class AzureAdLoginHandler(OAuthLoginHandler, AzureAdMixin):
    pass


class AzureAdOAuthenticator(OAuthenticator):
    login_service = Unicode(
		os.environ.get('LOGIN_SERVICE', 'Azure AD'),
		config=True,
		help="""Azure AD domain name string, e.g. My College"""
	)

    login_handler = AzureAdLoginHandler

    tenant_id = Unicode(config=True)
    username_claim = Unicode(config=True)

    @default('tenant_id')