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PEP 765: specify when the SyntaxWarning will be emitted, and explain why #4132

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PEP 765: specify when the SyntaxWarning will be emitted, and explain why #4132

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PEP 765: specify when the SyntaxWarning will be emitted, and explain why
iritkatriel Nov 21, 2024
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typos
iritkatriel Nov 21, 2024
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Update pep-0765.rst
iritkatriel Nov 21, 2024
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10 changes: 10 additions & 0 deletions peps/pep-0765.rst
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Expand Up @@ -132,6 +132,16 @@ However, we specify here that a ``SyntaxError`` is permitted by
the language spec, so that other Python implementations can choose
to implement that.

The CPython implementation will emit the ``SyntaxWarning`` during
``AST`` construction, to ensure that the warning will show up during
static anlaysis and compilation, but not during execution of
pre-compiled code. We expect that the warning will be seen by
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project maintainer (when they run static analysis, or CI which
does not have precompiled files). However, end users of a project
will only see a warning if they skip precompilation at installation
time, check installation time warnings, or run static analysis over
their dependencies.

Backwards Compatibility
=======================

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