code: def create_fork(self, organization=None):
          
          url = self._build_url('forks', base_url=self._api)
          if organization:
              resp = self._post(url, data={'organization': organization})
          else:
              resp = self._post(url)
          json = self._json(resp, 202)
  
          return Repository(json, self) if json else None
docs: Create a fork of this repository.
  
          :param str organization: (required), login for organization to create
              the fork under
          :returns: :class:`Repository <Repository>` if successful, else None