Method as_poly

Singular/dyn_modules/python/Poly.h:334–337

    typedef PolyBase<variant,create_type_input,error_handle_traits> ThisType;
 public:
  poly as_poly() const
  {
    return p_Copy(ptr->p,ptr->getRing());
  }
  template<class T> void checkIsSameRing(T& p)
  {
    if (error_handle_traits::handleErrors)