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gvanrossum merged 4 commits into from
Mar 7, 2020
Merged

bpo-39702: Update the Language Reference (PEP 614). #18802

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bb6d834
What's New.
brandtbucher Mar 4, 2020
36f0f52
Catch up with master.
brandtbucher Mar 6, 2020
a8f0dcf
Update the Language Reference.
brandtbucher Mar 6, 2020
32345bd
Make versionchanged note more specific.
brandtbucher Mar 7, 2020
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12 changes: 11 additions & 1 deletion Doc/reference/compound_stmts.rst
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Expand Up @@ -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`
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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
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4 changes: 4 additions & 0 deletions Doc/whatsnew/3.9.rst
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Expand Up @@ -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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