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bpo-32892: Update the documentation for handling constants in AST. (GH-18514)

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Serhiy Storchaka 2020-02-17 11:03:00 +02:00 committed by GitHub
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commit 85a2eef473
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2 changed files with 13 additions and 3 deletions
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10
Doc/library/ast.rst
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@ -101,12 +101,16 @@ Node classes
node = ast.UnaryOp(ast.USub(), ast.Constant(5, lineno=0, col_offset=0),
lineno=0, col_offset=0)
.. versionchanged:: 3.8
Class :class:`ast.Constant` is now used for all constants.
.. deprecated:: 3.8
Class :class:`ast.Constant` is now used for all constants. Old classes
:class:`ast.Num`, :class:`ast.Str`, :class:`ast.Bytes`,
Old classes :class:`ast.Num`, :class:`ast.Str`, :class:`ast.Bytes`,
:class:`ast.NameConstant` and :class:`ast.Ellipsis` are still available,
but they will be removed in future Python releases.
but they will be removed in future Python releases. In the meanwhile,
instantiating them will return an instance of a different class.
.. _abstract-grammar:

6
Doc/whatsnew/3.8.rst
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@ -1940,6 +1940,12 @@ Changes in the Python API
:exc:`dbm.gnu.error` or :exc:`dbm.ndbm.error`) instead of :exc:`KeyError`.
(Contributed by Xiang Zhang in :issue:`33106`.)
* Simplified AST for literals. All constants will be represented as
:class:`ast.Constant` instances. Instantiating old classes ``Num``,
``Str``, ``Bytes``, ``NameConstant`` and ``Ellipsis`` will return
an instance of ``Constant``.
(Contributed by Serhiy Storchaka in :issue:`32892`.)
* :func:`~os.path.expanduser` on Windows now prefers the :envvar:`USERPROFILE`
environment variable and does not use :envvar:`HOME`, which is not normally
set for regular user accounts.