docs: def get_outside_collaborators(self, filter_=github.GithubObject.NotSet):
          """
          :calls: `GET /orgs/:org/outside_collaborators <http://developer.github.com/v3/orgs/outside_collaborators>`_
          :param filter_: string
          :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.NamedUser.NamedUser`
          """
          assert (filter_ is github.GithubObject.NotSet or
                  isinstance(filter_, (str, unicode))), filter_
  
          url_parameters = {}
          if filter_ is not github.GithubObject.NotSet:
              url_parameters["filter"] = filter_
          return github.PaginatedList.PaginatedList(
              github.NamedUser.NamedUser,
              self._requester,
              self.url + "/outside_collaborators",
              url_parameters
          )