[Python-Dev] Re: PEP-317

[Steven Taschuk]

Quoth Guido van Rossum:
  [...]
> Python usually doesn't care about isinstance relationships but cares
> about whether the needed protocol is implemented, and this suggests
> that requiring exceptions to subclass Exception is unPythonic.

This came up in python-list not long ago [1], and I raised (heh)
exactly that argument.  Alex Martelli counterargued that
exceptions are one area in which we *do* usually care about
isinstance relationships, since that's how we specify which
exceptions to catch.

[1] http://mail.python.org/pipermail/python-list/2003-May/160965.html

-- 
Steven Taschuk                           staschuk@telusplanet.net
"I'm always serious, never more so than when I'm being flippant."
                            -- _Look to Windward_, Iain M. Banks