[Python-3000] Generic function PEP won't make it in time

[Phillip J. Eby]

At 08:49 PM 4/25/2007 -0700, Guido van Rossum wrote:
>Then how do you explain the popularity of zope.interfaces in both the
>Zope and the Twisted world?

In a word: adaptation.

(Caveat: it's been a while since I looked at very much of Twisted, and even 
longer for Zope; but ISTR that Twisted hardly ever checked to see what 
things implemented, compared to how often it just adapted.  Zope 3, 
meanwhile, has major infrastructure built on adaptation, even though it 
does do some introspection and typechecking.)