is_MPolynomial

[Luis Finotti]

Hello,

I am getting warnings that is_MPolynomial is deprecated.  The error suggests to use

isinstance(x, sage.structure.element.MPolynomial)

But this gives an error:

AttributeError: module 'sage.structure.element' has no attribute 'MPolynomial'

Looking at the referred github report (https://github.com/sagemath/sage/issues/32709) it is suggested to use isinstance(x, MPolynomial),

 which also fails with

NameError: name 'MPolynomial' is not defined

So, what is the proper way now?

[Dima Pasechnik]

On Tue, Jun 27, 2023 at 12:54 PM Luis Finotti <luis.f...@gmail.com> wrote:
>
> Hello,
>
> I am getting warnings that is_MPolynomial is deprecated. The error suggests to use
>
> isinstance(x, sage.structure.element.MPolynomial)
>
> But this gives an error:
>
> AttributeError: module 'sage.structure.element' has no attribute 'MPolynomial'

probably a typo in deprecation message. You can ask Sage:

sage: import_statements("MPolynomial")
from sage.rings.polynomial.multi_polynomial import MPolynomial

>
> Looking at the referred github report (https://github.com/sagemath/sage/issues/32709) it is suggested to use isinstance(x, MPolynomial),
> which also fails with
>
> NameError: name 'MPolynomial' is not defined
>
> So, what is the proper way now?
>

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[Dima Pasechnik]

this is now https://github.com/sagemath/sage/issues/35844

[Luis Finotti]

Thanks!  It works now.