Would it be possible to drop the requirement that multiple exception types are parenthesized? Is it only ambiguous with the old Python2 syntax?
On Sat, 8 May 2021, 20:15 Guido van Rossum, <gu...@python.org> wrote: > I propose “exception tuple”, since syntactically and semantically it must > be a tuple. (Same as for isinstance() and issubclass().) > > On Sat, May 8, 2021 at 05:52 Thomas Grainger <tagr...@gmail.com> wrote: > >> That's this bit: >> >> ``` >> except (A, B): >> ^^^^^^ >> ``` >> >> bpo-43149 currently calls it an "exception group", but that conflicts >> with PEP 654 -- Exception Groups and except* >> >> ``` >> >> >>> try: >> ... pass >> ... except A, B: >> ... pass >> Traceback (most recent call last): >> SyntaxError: exception group must be parenthesized >> ``` >> >> some alternatives: >> >> exception classinfo must be parenthesized (classinfo so named from the >> parameter to issubclass) >> exception sequence must be parenthesized >> >> see also: >> >> - https://github.com/python/cpython/pull/24467#discussion_r628756347 >> - https://www.python.org/dev/peps/pep-0654/ >> _______________________________________________ >> Python-Dev mailing list -- python-dev@python.org >> To unsubscribe send an email to python-dev-le...@python.org >> https://mail.python.org/mailman3/lists/python-dev.python.org/ >> Message archived at >> https://mail.python.org/archives/list/python-dev@python.org/message/HSN6ESRB4BD6IUIPKLMNP4TPBQPWHBFK/ >> Code of Conduct: http://python.org/psf/codeofconduct/ >> > -- > --Guido (mobile) >
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