From 18f1c60a1625d341a905c7e07367c32c08f222df Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= Date: Mon, 4 May 2020 21:02:00 +0200 Subject: bpo-40360: Add a What's New entry for lib2to3 pending deprecation (GH-19898) --- Doc/whatsnew/3.9.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst index cefaf57..11e577b 100644 --- a/Doc/whatsnew/3.9.rst +++ b/Doc/whatsnew/3.9.rst @@ -608,6 +608,16 @@ Deprecated * Passing ``None`` as the first argument to the :func:`shlex.split` function has been deprecated. (Contributed by Zackery Spytz in :issue:`33262`.) +* The :mod:`lib2to3` module now emits a :exc:`PendingDeprecationWarning`. + Python 3.9 switched to a PEG parser (see :pep:`617`), and Python 3.10 may + include new language syntax that is not parsable by lib2to3's LL(1) parser. + The ``lib2to3`` module may be removed from the standard library in a future + Python version. Consider third-party alternatives such as `LibCST`_ or + `parso`_. + (Contributed by Carl Meyer in :issue:`40360`.) + +.. _LibCST: https://libcst.readthedocs.io/ +.. _parso: https://parso.readthedocs.io/ Removed ======= -- cgit v0.12