[3.10] bpo-40360: [doc] Rephrase deprecation note about lib2to3 (GH-28122) by miss-islington · Pull Request #28127 · python/cpython

@@ -464,12 +464,15 @@ and off individually. They are described here in more detail.
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.. deprecated:: 3.10 Python 3.9 will switch 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`_. .. deprecated-removed:: 3.11 3.13 Python 3.9 switched to a PEG parser (see :pep:`617`) while lib2to3 is using a less flexible LL(1) parser. Python 3.10 includes new language syntax that is not parsable by lib2to3's LL(1) parser (see :pep:`634`). The ``lib2to3`` module was marked pending for deprecation in Python 3.9 (raising :exc:`PendingDeprecationWarning` on import) and fully deprecated in Python 3.11 (raising :exc:`DeprecationWarning`). It will be removed from the standard library in Python 3.13. Consider third-party alternatives such as `LibCST`_ or `parso`_.
.. note::