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PEP 679: Updates based on Discourse discussion #4600

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pablogsal merged 1 commit into from
Sep 21, 2025
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PEP 679: Updates based on Discourse discussion #4600

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13 changes: 6 additions & 7 deletions peps/pep-0679.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@ Status: Draft
Type: Standards Track
Created: 07-Jan-2022
Python-Version: 3.15
Post-History: `10-Jan-2022 <https://discuss.python.org/t/pep-679-allow-parentheses-in-assert-statements/13003>`__
Post-History: `08-Sep-2025 <https://discuss.python.org/t/pep-679-new-assert-statement-syntax-with-parentheses/103634>`__,
`10-Jan-2022 <https://discuss.python.org/t/pep-679-allow-parentheses-in-assert-statements/13003>`__


Abstract
Expand Down Expand Up @@ -132,10 +133,10 @@ specification.
(Note that, without the warning specification the pure parser implementation is
a small grammar change [#previmp]_).
To raise the warning, the compiler must
be aware of the new syntax, which means that a flag would be necessary as
otherwise the information is lost during parsing.
As such, the AST of an :keyword:`assert` would look like so,
with a ``paren_syntax`` flag::
be aware of the new syntax, this means that an optional flag would be necessary
as otherwise the information is lost during parsing.
As such, the AST of an :keyword:`assert` with parentheses would look like so,
with a ``paren_syntax=1`` flag::

>>> print(ast.dump(ast.parse('assert(True, "Error message")'), indent=4))
Module(
Expand All @@ -145,8 +146,6 @@ with a ``paren_syntax`` flag::
msg=Constant(value='Error message'),
paren_syntax=1)])

The flag would be removed in 3.18 along with the :exc:`SyntaxWarning`.


Implementing in the compiler
----------------------------
Expand Down