code: def pyxwriter(self):
          
          model = self.Model()
          if hasattr(self, 'Parameters'):
              model.parameters = self.Parameters(vars(self))
          else:
              model.parameters = parametertools.Parameters(vars(self))
          if hasattr(self, 'Sequences'):
              model.sequences = self.Sequences(model=model, **vars(self))
          else:
              model.sequences = sequencetools.Sequences(model=model,
                                                        **vars(self))
          return PyxWriter(self, model, self.pyxfilepath)
docs: Update the pyx file.