code: def find_helping_materials(project_id, **kwargs):
      
      try:
          kwargs['project_id'] = project_id
          res = _pybossa_req('get', 'helpingmaterial', params=kwargs)
          if type(res).__name__ == 'list':
              return [HelpingMaterial(helping) for helping in res]
          else:
              return res
      except:  # pragma: no cover
          raise
docs: Return a list of matched helping materials for a given project ID.
  
      :param project_id: PYBOSSA Project ID
      :type project_id: integer
      :param kwargs: PYBOSSA HelpingMaterial members
      :type info: dict
      :rtype: list
      :returns: A list of helping materials that match the kwargs