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

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Irit Katriel 2024-11-21 23:02:24 +00:00 committed by GitHub
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@ -132,6 +132,16 @@ However, we specify here that a ``SyntaxError`` is permitted by
the language spec, so that other Python implementations can choose the language spec, so that other Python implementations can choose
to implement that. 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 a
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 Backwards Compatibility
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