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polynomial ring instance check

asked 2012-01-18 10:32:10 -0500

araichev gravatar image

Hi there, folks. How do i check if something is an instance of a polynomial ring (univariate or multivariate)?

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answered 2012-01-18 12:17:52 -0500

Volker Braun gravatar image

First of all, do you really need to? Just allow any input, if it does not have the methods you are calling then you will get a suitable AttributeError exception thrown. AKA duck-typing.

If you are sure that you actually have to check the type, use the convenience functions:

sage: from sage.rings.polynomial.polynomial_ring import is_PolynomialRing
sage: is_PolynomialRing('string')
False
sage: from sage.rings.polynomial.multi_polynomial_ring import is_MPolynomialRing
sage: is_MPolynomialRing('string')                                              
False
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Asked: 2012-01-18 10:32:10 -0500

Seen: 76 times

Last updated: Jan 18 '12