Hi Carl!
On Sun, Mar 15, 2009 at 06:11:52AM -0700, Carl Witty wrote:
>
> On Sat, Mar 14, 2009 at 11:42 PM, Nicolas M. Thiery
> <[email protected]> wrote:
> > In fact, I'd love to be able to do:
> >
> > from SymmetricFunctions(QQ).shorthands import *
> >
> > Furthermore, providing the user with (optional but easy to load)
> > shorthands promotes their standardization among all users. This makes
> > it much easier for them to share worksheets / little calculations / ...
> How about this syntax instead?
> %open SymmetricFunctions(QQ).shorthands
> The leading '%' makes it clear that something strange is going on here.
Yes, thanks for the suggestion! Or maybe:
%from SymmetricFunctions(QQ) import shorthands
for consistency: the user just needs to know one synta× for imports,
and to remember that, here, this is a pseudo import from something
which is not actually a module.
> we don't want to introduce more subtle differences between the
> command line and the library syntax.
+10
Well, let's just keep this in the back of our head for the
moment. Being able to do S = SymmetricFunctions(QQ).shorthands,
and then S.s(...) + S.h(...) is already pretty good.
Cheers,
Nicolas
PS: Warning: geek discussion for the fun and the curiosity. It is not
required for the main discussion.
> > from SymmetricFunctions(QQ).shorthands import *
> >
> Unfortunately, this can't work -- that's a syntax error in Python, and
> I don't think there's any standard way to get the functionality you
> want.
The syntax error comes from the (). Otherwise one can do some wicked
tricks like:
sage: from bla import *
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
...
ImportError: No module named bla
sage: class bla:
... x = 1
... y = 2
... z = 3
...
sage: sys.modules['bla'] = bla
sage: from bla import *
sage: x
1
sage: y
2
sage: z
3
sage:
So maybe the door is not completely closed for some horrible (but well
localized) hack around :-)
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <[email protected]>
http://Nicolas.Thiery.name/
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