On Sun, 6 Nov 2011 09:49:27 +0200 Petri Lehtinen <pe...@digip.org> wrote: > list.index() and list.tuple() don't currently accept None as slice > parameters, as reported in http://bugs.python.org/issue13340. For > example: > > >>> [1, 2, 3].index(2, None, None) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: slice indices must be integers or None or have an __index__ method > > The error message of list.index() and tuple.index() (as a consequence > of using _PyEval_SliceIndex() for parsing arguments) indicates that > None is a valid value. > > Currently, find(), rfind(), index(), rindex(), count(), startswith() > and endswith() of str, bytes and bytearray accept None. Should > list.index() and tuple.index() accept it, too?
Either that or fix the error message. I can't find much benefit in accepting None, that said (nor in refusing it). Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
