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| author | Miro Hrončok <miro@hroncok.cz> | 2020-05-04 19:02:00 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-05-04 19:02:00 (GMT) |
| commit | 18f1c60a1625d341a905c7e07367c32c08f222df (patch) | |
| tree | 81fdce1c5345bcabd4d358c7647c0cbb5a1c4c32 | |
| parent | 975408c065b645e7d717546b0d744415abb45cd1 (diff) | |
| download | cpython-18f1c60a1625d341a905c7e07367c32c08f222df.zip cpython-18f1c60a1625d341a905c7e07367c32c08f222df.tar.gz cpython-18f1c60a1625d341a905c7e07367c32c08f222df.tar.bz2 | |
bpo-40360: Add a What's New entry for lib2to3 pending deprecation (GH-19898)
| -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 ======= |