[Chicago] Get/Set/Accessors in Python?

[Philip Doctor]

Tim,
I agree that they get misused a lot (especially in C#) but I see it's very
common to put validation in a set in c#.  So maybe syntactically it looks
like you're just setting myCar.Speed to 60, but in myCar it's validating
that Speed is not negative and it's less than MaxSpeed, etc etc.  I
actually see this happening more and more in C# with data attributes in
msft MVC.  They have a public get/set and then an annotation that indicates
things like not negative or required, etc etc.  I guess the caveat being
that without a return value, your only way to really communicate that a
value is out of bounds is with an exception throw, so your developers need
to be comfortable with that kind of getter/setter feedback.

My only point in this ramble being that public get/set, while often cargo
culted in and bad style, can actually still be quite useful in c# and a
little bit better than a public variable :)




On Wed, Dec 5, 2012 at 10:15 AM, Brian Curtin <brian at python.org> wrote:

> On Wed, Dec 5, 2012 at 9:38 AM, Malcolm Newsome
> <malcolm.newsome at gmail.com> wrote:
> > Additionally, a separate, but perhaps related question is that I have not
> > seen public/private classes in Python.  How might this factor into the
> whole
> > accessor scenario?  (Or, am I trying to relate two topics that have
> nothing
> > to do with each other?)
>
> There's no notion of private classes, but you could create private
> attributes on a class using a leading double underscore. I and most
> others don't recommend doing this.
>
> class MyClass:
>     def __private(self):
>         ...
>
> Python uses "name mangling" to hide the __private method, but nothing
> is stopping you from unmangling the name and just calling mangled
> names.
>
> Check out this first paragraph for more information:
> http://en.wikipedia.org/wiki/Python_syntax_and_semantics#Objects
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