code: def remove_permission(self, file_id, permission_id):
          
          url = '{0}/{1}/permissions/{2}'.format(
              DRIVE_FILES_API_V2_URL,
              file_id,
              permission_id
          )
  
          self.request('delete', url)
docs: Deletes a permission from a file.
  
          :param file_id: a spreadsheet ID (aka file ID.)
          :type file_id: str
          :param permission_id: an ID for the permission.
          :type permission_id: str