code: def _write_entries(self, stream, entries, converter, properties=None):
          
          def iter_entries():
              for c in entries:
                  entry = converter(c)
                  if entry is None:
                      continue
                  if properties is not None:
                      entry = OrderedDict(
                          (key, value) for key, value in iteritems(entry)
                          if key == 'id' or key in properties)
                  yield entry
  
          self._dump(stream, list(iter_entries()))
docs: Write iterable of entries as YAML object to stream.
  
          Args:
              stream: File-like object.
              entries: Iterable of entries.
              converter: Conversion function from entry to YAML object.
              properties: Set of compartment properties to output (or None to
                  output all).