code: def thumbnail(self, id):
          
          res = self._raw_api_request('thumb', data={'i': id})
          if not res:
              raise PuushError("Getting thumbnail failed.")
          return res
docs: Get the 100x100 thumbnail of a file. Return the raw PNG data.
          
          Parameters:
              * id: The Puush ID of the file to get the thumbnail of.