def create_key(self, title, key):
        """
        :calls: `POST /user/keys <http://developer.github.com/v3/users/keys>`_
        :param title: string
        :param key: string
        :rtype: :class:`github.UserKey.UserKey`
        """
        assert isinstance(title, (str, unicode)), title
        assert isinstance(key, (str, unicode)), key
        post_parameters = {
            "title": title,
            "key": key,
        }
        headers, data = self._requester.requestJsonAndCheck(
            "POST",
            "/user/keys",
            input=post_parameters
        )
        return github.UserKey.UserKey(self._requester, headers, data, completed=True)
:calls: `POST /user/keys <http://developer.github.com/v3/users/keys>`_
        :param title: string
        :param key: string
        :rtype: :class:`github.UserKey.UserKey`