Python "implements <interface>" equivalent?

[Sion Arrowsmith]

Grant Edwards  <grante at visi.com> wrote:
>   try:
>       myobj.feature1()
>   except AttributeError:
>       print "object doesn't implement feature1"
>    
>isn't correct, since an unhandled AttributeError generated by
>the feature1 method will print "object doesn't implement
>feature1".

I'd be tempted to argue that it *was* correct, since the object
doesn't implement a feature1 which can be used. (This is the cue
for someone to talk about making sure that myobj's class has
been thoroughly unit tested.)

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