docs: def write_xyz(self, *args, **kwargs):
          """Deprecated, use :meth:`~chemcoord.Cartesian.to_xyz`
          """
          message = 'Will be removed in the future. Please use to_xyz().'
          with warnings.catch_warnings():
              warnings.simplefilter("always")
              warnings.warn(message, DeprecationWarning)
          return self.to_xyz(*args, **kwargs)