code: def _gen_s3_path(self, model, props):
          
  
          now = '%.5f' % time.time()
  
          return '%s/%s/%s/%s.%s' % (model.rtype, model.rid_value,
                                     self._s3_rtype, now, props['file-ext'])
docs: Return the part of the S3 path based on inputs
  
          The path will be passed to the s3_upload method &
          will ultimately be merged with the standard AWS S3
          URL.
  
          An example model type of 'users' with a resource ID
          of 99 & an API endpoint ending with 'photos' will have
          a path generated in the following way:
  
              users/99/photos/<timestamp>.<extension>
  
          The timestamp is a high precision timestamp & the
          extension is typically 3 characters & derived in
          the form-data deserializer.