code: def _upload_resumable_all(self, upload_info, bitmap,
                                number_of_units, unit_size):
          
  
          fd = upload_info.fd
  
          upload_key = None
  
          for unit_id in range(number_of_units):
              upload_status = decode_resumable_upload_bitmap(
                  bitmap, number_of_units)
  
              if upload_status[unit_id]:
                  logger.debug("Skipping unit %d/%d - already uploaded",
                               unit_id + 1, number_of_units)
                  continue
  
              logger.debug("Uploading unit %d/%d",
                           unit_id + 1, number_of_units)
  
              offset = unit_id * unit_size
  
              with SubsetIO(fd, offset, unit_size) as unit_fd:
  
                  unit_info = _UploadUnitInfo(
                      upload_info=upload_info,
                      hash_=upload_info.hash_info.units[unit_id],
                      fd=unit_fd,
                      uid=unit_id)
  
                  upload_result = self._upload_resumable_unit(unit_info)
  
                  # upload_key is needed for polling
                  if upload_key is None:
                      upload_key = upload_result['doupload']['key']
  
          return upload_key
docs: Prepare and upload all resumable units and return upload_key
  
          upload_info -- UploadInfo object
          bitmap -- bitmap node of upload/check
          number_of_units -- number of units requested
          unit_size -- size of a single upload unit in bytes