code: def get(self, id):
          
          url = utils.urljoin(self.url, id)
          response = self.session.get(url)
          return Group(self, **response.data)
docs: Get a single group by ID.
  
          :param str id: a group ID
          :return: a group
          :rtype: :class:`~groupy.api.groups.Group`