[Tutor] Accessing class attributes: use methods only?
carroll at tjc.com
Wed Feb 14 20:10:58 CET 2007
On Wed, 14 Feb 2007, Dave Kuhlman wrote:
> On Tue, Feb 13, 2007 at 11:35:47PM -0500, Kent Johnson wrote:
> > Bob Gailer wrote:
> > > I really like the simplicity of a.b = 3. I groan when put in other
> > > environments where a method call is required.
> > >
> > > And Python has the magic method __setattr__ to intercept attribute
> > > assignment for the times where some inspection / protection /
> > > side-effect action is desired.
> > The modern way to do this (since Python 2.2 I think) is to use
> > properties. __setattr__ has other uses (for example for delegation) but
> > it is too big a hammer for changing the behaviour of a single attribute.
> Some of us old school types feel that properties are non-Pythonic.
> They are a way to write code that does something that it does not
> look like that code is doing. It hides your intend. So, it is not
Using __setattr__ is at least as sneaky, though.
If the sneakiness bothers you, use a setter/getter method and lose that
simplicity Bob refers to.
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