Correctly aggregate narrowing information on parent expressions#21206
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hauntsaninja merged 4 commits intopython:masterfrom Apr 13, 2026
Merged
Correctly aggregate narrowing information on parent expressions#21206hauntsaninja merged 4 commits intopython:masterfrom
hauntsaninja merged 4 commits intopython:masterfrom
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ilevkivskyi
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Apr 13, 2026
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Thanks! This makes things much cleaner.
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Diff from mypy_primer, showing the effect of this PR on open source code: spark (https://github.com/apache/spark)
- python/pyspark/pandas/typedef/typehints.py:163: error: Item "str" of "str | type | dtype[Any] | ExtensionDtype" has no attribute "__args__" [union-attr]
- python/pyspark/pandas/typedef/typehints.py:163: error: Item "type" of "str | type | dtype[Any] | ExtensionDtype" has no attribute "__args__" [union-attr]
- python/pyspark/pandas/typedef/typehints.py:163: error: Item "dtype[Any]" of "str | type | dtype[Any] | ExtensionDtype" has no attribute "__args__" [union-attr]
- python/pyspark/pandas/typedef/typehints.py:163: error: Item "ExtensionDtype" of "str | type | dtype[Any] | ExtensionDtype" has no attribute "__args__" [union-attr]
altair (https://github.com/vega/altair)
- altair/vegalite/v6/api.py:5171: error: Item "UndefinedType" of "Any | Sequence[VariableParameter | TopLevelSelectionParameter | SelectionParameter] | UndefinedType" has no attribute "__iter__" (not iterable) [union-attr]
discord.py (https://github.com/Rapptz/discord.py)
- discord/channel.py:2192: error: Incompatible return value type (got "list[VoiceChannel | StageChannel | ForumChannel | TextChannel | CategoryChannel]", expected "list[TextChannel]") [return-value]
- discord/channel.py:2199: error: Incompatible return value type (got "list[VoiceChannel | StageChannel | ForumChannel | TextChannel | CategoryChannel]", expected "list[VoiceChannel]") [return-value]
- discord/channel.py:2209: error: Incompatible return value type (got "list[VoiceChannel | StageChannel | ForumChannel | TextChannel | CategoryChannel]", expected "list[StageChannel]") [return-value]
- discord/channel.py:2219: error: Incompatible return value type (got "list[VoiceChannel | StageChannel | ForumChannel | TextChannel | CategoryChannel]", expected "list[ForumChannel]") [return-value]
jax (https://github.com/google/jax)
+ jax/_src/interpreters/pxla.py:570: error: Unused "type: ignore" comment [unused-ignore]
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Fixes #21204 , fixes #20596
The extra narrowing we perform in mypy 1.20 exposes this much longer standing issue