code: def _report_part(api, url, upload, part, e_tag):
      
      part_data = {
          'part_number': part,
          'response': {
              'headers': {
                  'ETag': e_tag
              }
          }
      }
      try:
          api.post(
              url.format(upload_id=upload, part_number=''), data=part_data
          )
      except Exception as e:
          raise SbgError(
              'Unable to report part number {}. Reason: {}'.format(
                  part, six.text_type(e)
              )
          )
docs: Used by the worker to report the completion of the part upload.
      :param api: Api instance.
      :param url: Part url.
      :param upload: Upload identifier.
      :param part: Part number.
      :param e_tag: ETag