[Python-checkins] bpo-39702: Update the Language Reference (PEP 614) (GH-18802)
Brandt Bucher
webhook-mailer at python.org
Sat Mar 7 13:23:54 EST 2020
https://github.com/python/cpython/commit/8f130536926a30237b5297780d61ef4232e88577
commit: 8f130536926a30237b5297780d61ef4232e88577
branch: master
author: Brandt Bucher <brandtbucher at gmail.com>
committer: GitHub <noreply at github.com>
date: 2020-03-07T10:23:49-08:00
summary:
bpo-39702: Update the Language Reference (PEP 614) (GH-18802)
files:
M Doc/reference/compound_stmts.rst
M Doc/whatsnew/3.9.rst
diff --git a/Doc/reference/compound_stmts.rst b/Doc/reference/compound_stmts.rst
index ac2065b4cff9b..c14e7c79fe14c 100644
--- a/Doc/reference/compound_stmts.rst
+++ b/Doc/reference/compound_stmts.rst
@@ -507,7 +507,7 @@ A function definition defines a user-defined function object (see section
funcdef: [`decorators`] "def" `funcname` "(" [`parameter_list`] ")"
: ["->" `expression`] ":" `suite`
decorators: `decorator`+
- decorator: "@" `dotted_name` ["(" [`argument_list` [","]] ")"] NEWLINE
+ decorator: "@" `assignment_expression` NEWLINE
dotted_name: `identifier` ("." `identifier`)*
parameter_list: `defparameter` ("," `defparameter`)* "," "/" ["," [`parameter_list_no_posonly`]]
: | `parameter_list_no_posonly`
@@ -550,6 +550,11 @@ is roughly equivalent to ::
except that the original function is not temporarily bound to the name ``func``.
+.. versionchanged:: 3.9
+ Functions may be decorated with any valid :token:`assignment_expression`.
+ Previously, the grammar was much more restrictive; see :pep:`614` for
+ details.
+
.. index::
triple: default; parameter; value
single: argument; function definition
@@ -717,6 +722,11 @@ is roughly equivalent to ::
The evaluation rules for the decorator expressions are the same as for function
decorators. The result is then bound to the class name.
+.. versionchanged:: 3.9
+ Classes may be decorated with any valid :token:`assignment_expression`.
+ Previously, the grammar was much more restrictive; see :pep:`614` for
+ details.
+
**Programmer's note:** Variables defined in the class definition are class
attributes; they are shared by instances. Instance attributes can be set in a
method with ``self.name = value``. Both class and instance attributes are
diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst
index a59de485a95d3..befd6d0d940ab 100644
--- a/Doc/whatsnew/3.9.rst
+++ b/Doc/whatsnew/3.9.rst
@@ -138,6 +138,10 @@ Other Language Changes
There are similar changes for :class:`bytes` and :class:`bytearray` objects.
(Contributed by Serhiy Storchaka in :issue:`28029`.)
+* Any valid expression can now be used as a :term:`decorator`. Previously, the
+ grammar was much more restrictive. See :pep:`614` for details.
+ (Contributed by Brandt Bucher in :issue:`39702`.)
+
New Modules
===========
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