On Wed, Dec 23, 2009 at 2:48 PM, Nicolas M. Thiery
<nicolas.thi...@u-psud.fr> wrote:
> 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
That sounds very good.
> Any better suggestion for the location/name of this function?
> import_variables? Or should we use S.inject_shorthands() above?
>
Since we already have
sage: R.<x,y,z> = QQ[]
sage: R.inj
R.inject_variables R.injvar
sage: R.inject_variables()
Defining x, y, z
I think inject_variables would be good... or better might be to
deprecate inject_variables and change it to
inject_generators()
since that is what it really does. Thoughts?
-- William
--
To post to this group, send an email to sage-devel@googlegroups.com
To unsubscribe from this group, send an email to
sage-devel+unsubscr...@googlegroups.com
For more options, visit this group at http://groups.google.com/group/sage-devel
URL: http://www.sagemath.org
