def get_user(self, login=github.GithubObject.NotSet):
        """
        :calls: `GET /users/:user <http://developer.github.com/v3/users>`_ or `GET /user <http://developer.github.com/v3/users>`_
        :param login: string
        :rtype: :class:`github.NamedUser.NamedUser`
        """
        assert login is github.GithubObject.NotSet or isinstance(login, (str, unicode)), login
        if login is github.GithubObject.NotSet:
            return AuthenticatedUser.AuthenticatedUser(self.__requester, {}, {"url": "/user"}, completed=False)
        else:
            headers, data = self.__requester.requestJsonAndCheck(
                "GET",
                "/users/" + login
            )
            return github.NamedUser.NamedUser(self.__requester, headers, data, completed=True)