polynomial ring instance check
Hi there, folks. How do i check if something is an instance of a polynomial ring (univariate or multivariate)?
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
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Asked: 2012-01-18 17:32:10 +0100
Seen: 336 times
Last updated: Jan 18 '12
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