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PEP 765: What's New warnings filter suggestions #139658

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PEP 765: What's New warnings filter suggestions
ncoghlan Oct 6, 2025
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13 changes: 13 additions & 0 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -937,6 +937,19 @@ The compiler now emits a :exc:`SyntaxWarning` when a :keyword:`return`,
leaving a :keyword:`finally` block.
This change is specified in :pep:`765`.

For use cases where this change is inconvenient (such as those where the
warnings are redundant due to code linting), syntax warnings specifically
may be switched off via the :ref:`warning filter <warning-filter>`, using the
clause ``ignore::SyntaxWarning``. This can also be specified in combination
with a filter that converts other warnings to errors (for example, passing
``-Werror -Wignore::SyntaxWarning`` as CLI options, or setting
``PYTHONWARNINGS=error,ignore::SyntaxWarning``).

Note that applying such a filter at runtime (rather than via the interpreter's
startup configuration) will only suppress the warning in code that is compiled
*after* the filter is adjusted. Code that is compiled prior to the filter
adjustment (for example, when a module is imported) will still emit the warning.

(Contributed by Irit Katriel in :gh:`130080`.)


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