On Mon, Nov 19, 2007 at 01:41:46PM +0100, Bruno Desthuilliers wrote regarding Re: overriding methods - two questions: > > Steven D'Aprano a ?crit : > > On Fri, 16 Nov 2007 18:28:59 +0100, Bruno Desthuilliers wrote: > > > >>> Question 1: > >>> > >>> Given that the user of the API can choose to override foo() or not, how > >>> can I control the signature that they use? > >> While technically possible (using inspect.getargspec), trying to make > >> your code idiot-proof is a lost fight and a pure waste of time. > > > > > > Worse: it's actually counter-productive! > > > > The whole idea of being able to subclass a class means that the user > > should be able to override foo() *including* the signature. > > If you see subclassing as subtyping, the signatures should always stay > fully compatibles. >
Isn't that more what Zope-type interfaces are for than inheritance? I'm uncertain here, but I'm not persuaded that changing signature is bad. -- http://mail.python.org/mailman/listinfo/python-list
