[SciPy-user] Polynomial interpolation
Wed Apr 30 03:40:38 CDT 2008
On Wed, Apr 30, 2008 at 3:03 AM, Anne Archibald
> 2008/4/30 Robert Kern <email@example.com>:
> > On Wed, Apr 30, 2008 at 2:03 AM, Anne Archibald
> > <firstname.lastname@example.org> wrote:
> > > I can clean those up. But I'm not sure how to set things up as
> > > "properties" so that the right things happen when users try to
> > > manipulate the attributes.
> > If it doesn't feel right to you, don't do it. Your point about
> > properies giving a false sense of safety in this case is quite valid.
> > If it's not obvious how to apply properties nicely here, that might be
> > a good sign that properties aren't appropriate.
> Well, actually what I meant was I've never used properties at all and
> didn't find any useful documentation. I had in mind a fairly draconian
> configuration that made nearly everything readonly, though I suppose
> that would become cumbersome within my own methods.
Properties Lesson #1: Don't do that. :-)
Properties are useful to add functionality, or to expose functionality
with attribute syntax, which may be appropriate. *Removing*
functionality is not a good use of properties.
But anyways, the general solution for the internal cumbersomeness is
to not use the properties internally. Instead, the property should map
to a _private attribute, and internally, you just manipulate those.
> And anyway it
> doesn't really work for numpy arrays, since someone can always do b =
> A.unwritable_array; b[i,j]=3. But set_yi is a bit ugly.
All things considered, it's fine. Call it update_yi() if you feel it's
"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
-- Umberto Eco
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