> 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. [Steven T] > 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 Excellent argument. Thanks, Steve and Alex. --Guido van Rossum (home page: http://www.python.org/~guido/)
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