code: def __str__(self):  # pragma: no cover
      return "`%s` operation not supported by %s representation" % (
          self.func,
          self.poly.rep.__class__.__name__,
      )
  
imports: from sympy.utilities import public
label_desc: Use image node_id 2 for calling the OperationNotSupported obj's underlying member method code with example usage: obj.__str__() and returns: unknown