:calls: `GET /search/users <http://developer.github.com/v3/search>`_
        :param query: string
        :param sort: string ('followers', 'repositories', 'joined')
        :param order: string ('asc', 'desc')
        :param qualifiers: keyword dict query qualifiers
        :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`

def search_users(self, query, sort=github.GithubObject.NotSet, order=github.GithubObject.NotSet, **qualifiers):
        """
        :calls: `GET /search/users <http://developer.github.com/v3/search>`_
        :param query: string
        :param sort: string ('followers', 'repositories', 'joined')
        :param order: string ('asc', 'desc')
        :param qualifiers: keyword dict query qualifiers
        :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
        """
        assert isinstance(query, (str, unicode)), query
        url_parameters = dict()
        if sort is not github.GithubObject.NotSet:
            assert sort in ('followers', 'repositories', 'joined'), sort
            url_parameters["sort"] = sort
        if order is not github.GithubObject.NotSet:
            assert order in ('asc', 'desc'), order
            url_parameters["order"] = order

        query_chunks = []
        if query:
            query_chunks.append(query)

        for qualifier, value in qualifiers.items():
            query_chunks.append("%s:%s" % (qualifier, value))

        url_parameters["q"] = ' '.join(query_chunks)
        assert url_parameters["q"], "need at least one qualifier"

        return github.PaginatedList.PaginatedList(
            github.NamedUser.NamedUser,
            self.__requester,
            "/search/users",
            url_parameters
        )