[Python-ideas] method decorators @final and @override in Python 2.4

Mathias Panzenböck grosser.meister.morti at gmx.net
Sat Mar 28 16:21:51 CET 2009

Péter Szabó wrote:
> Hi,
> If Python had method decorators @final (meaning: it is an error to
> override this method in any subclass) and @override (meaning: it is an
> error not having this method in a superclass), I would use them in my
> projects (some of them approaching 20 000 lines of Python code) and
> I'll feel more confident writing object-oriented Python code. Java
> already has similar decorators or specifiers. Do you think it is a
> good idea to have these in Python?
> I've created a proof-of-concept implementation, which uses
> metaclasses, and it works in Python 2.4 an Python 2.5. See
> http://www.math.bme.hu/~pts/pobjects.py and
> http://www.math.bme.hu/~pts/pobjects_example.py
> Best regards,
> Péter

+1 on the idea.
however, using a metaclass would be to limiting imho. can you implement it in a 
different way? a lot of things people use metaclasses for work perfectly fine 
without them (instead use a superclass that overrides __new__ or similar).


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