[PyQt] Python or Qt/C++ property style

[Paul A. Giannaros]

On Fri, Nov 7, 2008 at 11:24 AM, Georg Altmann <george at george-net.de> wrote:
> Hello,
>
> I am thinking about wether I should use python properties in my code. As
> PyQt is currently following Qt style (getter: property(), setter:
> getProperty()), I am a bit undecided.
>
> Benefits of python properties from my point of view:
>
> 1. Code is more expressive (readability).
>
> Drawbacks:
>
> 1. Classes derived from Qt classes mix python and Qt property style
> (inconsistent).

I use python properties anyway -- I don't think it matters
particularly unless you're aiming to look as much like the Qt API as
possible (providing a PyQt-based library, for example).
Is PyQt5 going to use Python properties like other bindings do?

>
> 2. One more design decision to worry about: Is this a methos or is it a
> (readonly) property? You also have to remember this in the client code.

I'm not sure this is a real problem. It's a reasonably clear
distinction. I can't find the exact Python mailing list post, but
generally the Python 3.0 API is going to use properties where it makes
sense to do so -- one hard and fast rule that was mentioned was to use
it where the code runs in constant time.

> 3. Python properties do not natively support getter/setter overriding in
> subclasses.
> (I know there are ways around this, but I'd rather stick with what standard
> python provides.)
>
> 4. Bloats class definition (extra line for property()).

Qt also declares its properties (using the Q_PROPERTY macro).

>
> What do you think?
>
> Regards
> Georg
>
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