On Wed, Mar 28, 2012 at 05:39:51AM -0700, David Kohel wrote:
> Doing some magic to make 'QQ^2 in VectorSpaces' work
> might just do injustice to first-time users, since it defers
> the realization that they just made a typo -- unless
> VectorSpaces is no longer a Python class:
>
> sage: VectorSpaces
> <class 'sage.categories.vector_spaces.VectorSpaces'>
>
> rather an instance of the category of vector spaces.
The rationale for that magic is that ``V in VectorSpaces`` is a short,
readable, and unambiguous idiom for asking whether V is a vector space
(over some field).
For parameter-less categories like Fields, I don't have a feeling for
whether one should teach new users to use the idiom ``X in Fields`` or
``X in Fields()``. I tend to use the later mysefl.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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