Re: [sage-combinat-devel] Re: Constructing homs

2012-12-05 Thread Andrew Mathas 
Here's a related question: suppose I have an object G in sage. Is there a 
correct way to ask G if is it a CombinatorialFreeModule? I can check for

if hasattr(G,'_basis_keys'): ...

but I would have thought that there was a better way to do this...

Andrew

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Re: [sage-combinat-devel] Re: Constructing homs

2012-12-05 Thread Nicolas M. Thiery 
On Thu, Dec 06, 2012 at 01:13:09AM +, Dima Pasechnik wrote:
  Here's a related question: suppose I have an object G in sage. Is there a 
  correct way to ask G if is it a CombinatorialFreeModule? I can check for
 
  if hasattr(G,'_basis_keys'): ...
 
  but I would have thought that there was a better way to do this...
 isinstance?
 
 
 sage: F = CombinatorialFreeModule(QQ, ['a','b','c'])
 sage: isinstance(F,CombinatorialFreeModule)
 True
 sage: isinstance([],CombinatorialFreeModule)
 False

Depending on what you want to test exactly, you might or not want to do

sage: F in ModulesWithBasis

which will eventually include QQ^3, QQ['x'], ...

Cheers,

Nicolas
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Nicolas M. Thiéry Isil nthi...@users.sf.net
http://Nicolas.Thiery.name/

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