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base repository: python/cpython
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head repository: gpshead/cpython
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compare: claude/gifted-noether-pFmpK
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Commits on Jun 4, 2026

  1. gh-150877: Emit SyntaxWarning for 'from . lazy import x' 

    Whitespace between relative-import dots and the module name is
insignificant, so 'from . lazy import x' is parsed exactly like
'from .lazy import x'. With PEP 810's 'lazy' soft keyword that
spelling is most likely a transposition of 'lazy from . import x',
and if a sibling module named 'lazy' exists the typo silently
succeeds with completely different semantics (an eager import of
the wrong module).

The parser now uses the token positions (which are still available
even though whitespace is insignificant to the grammar) to detect a
gap between the last dot and a leading 'lazy' name component, and
emits a SyntaxWarning suggesting 'lazy from . import'. Under
warnings-as-errors it becomes a SyntaxError pointing at the module
name. No warning is emitted for 'from .lazy import x', for other
module names, or when the statement already uses the 'lazy' keyword.

_PyPegen_checked_future_import is renamed to
_PyPegen_checked_import_from and now receives the dot tokens and the
module-name expression so it can perform the check; the existing
__future__ handling is unchanged.

https://claude.ai/code/session_012LQ4pV2HZEh5NAVQUoipMt
    @claude
    claude committed Jun 4, 2026
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