code: def commit(self):
          
          if not self.is_attached():
              return
          changes = self.list_changes()
          if changes:
              indices, records = zip(*changes)
              if min(indices) > self._last_synced_index:
                  self.write(records, append=True)
              else:
                  self.write(append=False)
docs: Commit changes to disk if attached.
  
          This method helps normalize the interface for detached and
          attached tables and makes writing attached tables a bit more
          efficient. For detached tables nothing is done, as there is no
          notion of changes, but neither is an error raised (unlike with
          :meth:`write`). For attached tables, if all changes are new
          records, the changes are appended to the existing file, and
          otherwise the whole file is rewritten.