On Wed, Dec 23, 2009 at 02:37:22PM -0800, William Stein wrote:
> On Wed, Dec 23, 2009 at 2:31 PM, Nicolas M. Thiery
> <nicolas.thi...@u-psud.fr> wrote:
> > On Wed, Dec 23, 2009 at 02:01:22PM -0800, William Stein wrote:
> >> > I stumbled recently into a nifty feature of the IPython interpreter
> >> > allowing for easy manipulations of the global namespace of the
> >> > interpreter, at the python level. Thanks to it, one can now do:
> >> >
> >> > sage: S = SymmetricFunctions(ZZ)
> >> > sage: S.import_shorthands()
> >> > sage: s[1] + e[2] * p[1,1] + 2*h[3] + m[2,1]
> >> > s[1] - 2*s[1, 1, 1] + s[1, 1, 1, 1] + s[2, 1] + 2*s[2, 1, 1] + s[2,
> >> > 2] + 2*s[3] + s[3, 1]
> >> > sage: s
> >> > Symmetric Function Algebra over Integer Ring, Schur symmetric
> >> > functions as basis
> >> > sage: e
> >> > Symmetric Function Algebra over Integer Ring, Elementary symmetric
> >> > functions as basis
> >> > ...
> >>
> >> What happens in the notebook (which in no way uses IPython)? Does it
> >> at least fail gracefully?
> >
> > Good point. I am using that seldom the notebook that I did not even
> > think about it :-) Let me try ... Ok, as I expected, it's not that graceful:
> >
> > Traceback (click to the left for traceback)
> > ...
> > AttributeError: 'NoneType' object has no attribute 'to_user_ns'
> >
> > Is there an easy way to manipulate the global namespace for the
> > notebook? For IPython, I am using:
>
> No, not exactly. The notebook is just pure Python (right now).
>
> That said, from *Cython* you can get at the true global namespace by
> using the command globals(). See
>
> sage/sage/ext/interactive_constructors_c.pyx
>
> for code that does this sort of thing, which works uniformly in both
> IPython, pure python, and the notebook.
Yeah, I had seen this. I was specifically happy to have found a
non-cython way to do it. But uniformity has its value. I guess I'll
make a very small Python wrapper around the Cython globals call, and
then have import_shorthands use it.
sage: sage.misc.misc.inject_variables(dict('a':1, 'b':3))
sage: a
1
sage: b
3
Any better suggestion for the location/name of this function?
import_variables? Or should we use S.inject_shorthands() above?
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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