code: def to_xdr_object(self):
          
          line = self.line.to_xdr_object()
          limit = Operation.to_xdr_amount(self.limit)
  
          change_trust_op = Xdr.types.ChangeTrustOp(line, limit)
          self.body.type = Xdr.const.CHANGE_TRUST
          self.body.changeTrustOp = change_trust_op
          return super(ChangeTrust, self).to_xdr_object()
docs: Creates an XDR Operation object that represents this
          :class:`ChangeTrust`.