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

[Greg Ewing]

Emin.shopper Martinian.shopper wrote:

> Imagine you have a program that takes a long time to run. If you use 
> duck-typing or similar ideas you may watch the program run for hours or 
> days and then raise an AttributeError or NotImplemented error because a 
> derived class didn't implement a required method.

You should have a way of exercising the program with a set of
small test cases before using it for big runs. You need that
anyway, because there are many other ways the program could
fail at run-time that wouldn't be caught by this feature.

This is just another version of the argument for static type
checking, and all the same counter-arguments apply to it.

--
Greg