diff options
| -rw-r--r-- | Doc/library/2to3.rst | 14 | ||||
| -rw-r--r-- | Lib/lib2to3/__init__.py | 9 | ||||
| -rw-r--r-- | Lib/test/test___all__.py | 1 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2020-04-22-20-55-17.bpo-40360.Er8sv-.rst | 1 |
4 files changed, 20 insertions, 5 deletions
diff --git a/Doc/library/2to3.rst b/Doc/library/2to3.rst index eb4c9185f4..1d7bd26287 100644 --- a/Doc/library/2to3.rst +++ b/Doc/library/2to3.rst @@ -9,9 +9,7 @@ of *fixers* to transform it into valid Python 3.x code. The standard library contains a rich set of fixers that will handle almost all code. 2to3 supporting library :mod:`lib2to3` is, however, a flexible and generic library, so it is -possible to write your own fixers for 2to3. :mod:`lib2to3` could also be -adapted to custom applications in which Python code needs to be edited -automatically. +possible to write your own fixers for 2to3. .. _2to3-using: @@ -466,9 +464,17 @@ and off individually. They are described here in more detail. -------------- +.. 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`_. + .. note:: The :mod:`lib2to3` API should be considered unstable and may change drastically in the future. -.. XXX What is the public interface anyway? +.. _LibCST: https://libcst.readthedocs.io/ +.. _parso: https://parso.readthedocs.io/ diff --git a/Lib/lib2to3/__init__.py b/Lib/lib2to3/__init__.py index ea30561d83..4224dffef4 100644 --- a/Lib/lib2to3/__init__.py +++ b/Lib/lib2to3/__init__.py @@ -1 +1,8 @@ -#empty +import warnings + + +warnings.warn( + "lib2to3 package is deprecated and may not be able to parse Python 3.10+", + PendingDeprecationWarning, + stacklevel=2, +) diff --git a/Lib/test/test___all__.py b/Lib/test/test___all__.py index c077881511..0ba243ee4e 100644 --- a/Lib/test/test___all__.py +++ b/Lib/test/test___all__.py @@ -17,6 +17,7 @@ class AllTest(unittest.TestCase): names = {} with support.check_warnings( (".* (module|package)", DeprecationWarning), + (".* (module|package)", PendingDeprecationWarning), ("", ResourceWarning), quiet=True): try: diff --git a/Misc/NEWS.d/next/Library/2020-04-22-20-55-17.bpo-40360.Er8sv-.rst b/Misc/NEWS.d/next/Library/2020-04-22-20-55-17.bpo-40360.Er8sv-.rst new file mode 100644 index 0000000000..290dd453bd --- /dev/null +++ b/Misc/NEWS.d/next/Library/2020-04-22-20-55-17.bpo-40360.Er8sv-.rst @@ -0,0 +1 @@ +The :mod:`lib2to3` module is pending deprecation due to :pep:`617`.
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