code: def to_xdr_object(self):
          
          source_account = account_xdr_object(self.source)
          memo = self.memo.to_xdr_object()
          operations = [o.to_xdr_object() for o in self.operations]
          ext = Xdr.nullclass()
          ext.v = 0
          return Xdr.types.Transaction(source_account, self.fee, self.sequence,
                                       self.time_bounds, memo, operations, ext)
docs: Creates an XDR Transaction object that represents this
          :class:`Transaction`.