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Diffstat (limited to 'Doc/whatsnew/3.9.rst')
| -rw-r--r-- | Doc/whatsnew/3.9.rst | 10 |
1 files changed, 10 insertions, 0 deletions
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 ======= |