Python 3.14 exception format.

[tolomea]

Python 3.14 (via https://peps.python.org/pep-0758/) has made () around lists of exceptions in except clauses optional.

Black and Ruff preview styles are already formatting this way.
psf/black#4720
astral-sh/ruff#20768

It'd be nice to get this updated to handle the new style.

[hakancelikdev]

Thanks for the report and the PEP/links — made digging into it easy.

Fixed in #327, shipping in 1.4.0. The Python ast representation is identical for the parenthesized and PEP 758 forms, so no analyzer changes were needed — the only blocker was the libcst<=1.8.2 upper pin, since libcst < 1.8.3 raises ParserSyntaxError on the new syntax. Bumped the pin to <=1.8.6 and added Python 3.14 to requires-python, classifiers, tox, and CI.

Added a regression test under tests/cases/.../error/try_except_no_parens.py covering two- and three-exception variants. Verified by downgrading libcst to 1.8.2 locally — the new test fails with the exact ParserSyntaxError and all 96 other cases stay green, then 1.8.6 restores all 97 to green.

Will close this once 1.4.0 is tagged & on PyPI.

[tolomea]

Thanks for the prompt reply.