polynomial ring instance check
Hi there, folks. How do i check if something is an instance of a polynomial ring (univariate or multivariate)?
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
Asked: 2012-01-18 10:32:10 -0500
Seen: 75 times
Last updated: Jan 18 '12