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bpo-40360: Add a What's new entry for lib2to3 pending deprecation #19898

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May 4, 2020
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bpo-40360: Add a What's new entry for lib2to3 pending deprecation #19898

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10 changes: 10 additions & 0 deletions Doc/whatsnew/3.9.rst
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Expand Up @@ -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/

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