## fact: non regression testing for lifo and pygan classes#importlifoimportcle2000my_lifo=lifo.new()my_lifo.push(5)my_lifo.push(int)my_lifo.lib()my_fact=cle2000.new('fact',my_lifo,1)my_fact.exec()print("factorial(5)=",my_lifo.node(1))print("test fact completed")