610             can_append = self.docket.uuid is not None

   610             can_append = self.docket.uuid is not None

   611             packed, meta, append = self._map.write_v2(can_append)

   611             packed, meta, append = self._map.write_v2(can_append)

   612             if append:

   612             if append:

   613                 docket = self.docket

   613                 docket = self.docket

   614                 data_filename = docket.data_filename()

   614                 data_filename = docket.data_filename()

   617                 with self._opener(data_filename, b'r+b') as fp:

   615                 with self._opener(data_filename, b'r+b') as fp:

   618                     fp.seek(docket.data_size)

   616                     fp.seek(docket.data_size)

   619                     assert fp.tell() == docket.data_size

   617                     assert fp.tell() == docket.data_size

   620                     written = fp.write(packed)

   618                     written = fp.write(packed)

   621                     if written is not None:  # py2 may return None

   619                     if written is not None:  # py2 may return None