SWI-Prolog -- py_is

Availability::- use_module(library(janus)).(can be autoloaded)

True when Term is a Python object reference. Fails silently if Term is any other Prolog term.

Errors: existence_error(py_object, Term) is raised of Term is a Python object, but it has been freed using py_free/1.
Compatibility: PIP. The SWI-Prolog implementation is safe in the sense that an arbitrary term cannot be confused with a Python object and a reliable error is generated if the references has been freed. Portable applications can not rely on this.