On Mon, Sep 19, 2011 at 4:14 AM, Stan Schymanski <schym...@gmail.com> wrote:
> Dear Simon, Richard, Nils and Maarten,
>
> Thanks for putting so much thought into it. Unfortunately, most of what you
> are discussing is way beyond my horizon, so I can't really contribute. I had
> no clue how many things need to be considered before implementing my
> request.
>
> I just wanted to confirm that Simon summarised my request very accurately in
> the below text.
> Here is an example of a typical worksheet:
>
> var('T_a') # Air temperature (K)
> var('T_l') # Leaf temperature (K)
> var('R_ll') # Longwave radiation away from leaf per unit projected leaf
[...]
> Thanks heaps for your ideas!
I don't know if anybody mentioned this exactly, but something like you
want is *already* done in Sage for units, and you can take advantage
of that. Here's an example:
sage: T_a = sage.symbolic.units.UnitExpression(SR, var('T_a'));
T_a._sage_doc_ = lambda: "Air Temperature (K)"
Now when you introspect you get your docstring. Watch:
sage: T_a?
...
Docstring:
Air Temperature (K)
...
--------
You could put the above into a function:
def var2(name, doc):
z = sage.symbolic.units.UnitExpression(SR, SR(name))
z._sage_doc_ = lambda: str(doc)
return z
Use it like this (make sure to assign to T_a):
sage: T_a = var2('T_a', 'Air Temperature (K)')
sage: T_a?
Air Temperature (K)
William
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