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Fix type narrowing in lambda expressions #16407

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merged 1 commit into from Nov 4, 2023

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ilevkivskyi
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Fixes #4297

Fix is straightforward: without properly pushing lambda expression on the stack, the previous fix @JukkaL added for nested functions doesn't work for lambdas (it thinks that we are at global scope).

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github-actions bot commented Nov 4, 2023

Diff from mypy_primer, showing the effect of this PR on open source code:

openlibrary (https://github.com/internetarchive/openlibrary)
+ openlibrary/plugins/upstream/utils.py:813: error: Unused "type: ignore" comment  [unused-ignore]

jax (https://github.com/google/jax)
+ jax/_src/interpreters/pxla.py:2117: error: Unused "type: ignore" comment  [unused-ignore]

operator (https://github.com/canonical/operator)
+ ops/testing.py:1741: error: Unused "type: ignore" comment  [unused-ignore]

spark (https://github.com/apache/spark)
+ python/pyspark/sql/pandas/types.py:775: error: Unused "type: ignore" comment  [unused-ignore]
+ python/pyspark/sql/pandas/types.py:1032: error: Unused "type: ignore" comment  [unused-ignore]

discord.py (https://github.com/Rapptz/discord.py)
- discord/player.py:578: error: "None" not callable  [misc]
- discord/player.py:586: error: "None" not callable  [misc]
- discord/player.py:586: error: Argument 2 to "_probe_codec_fallback" of "FFmpegOpusAudio" has incompatible type "str | None"; expected "str"  [arg-type]
- discord/scheduled_event.py:654: error: Item "None" of "Snowflake | None" has no attribute "id"  [union-attr]
- discord/state.py:1101: error: Argument 1 to "store_emoji" of "ConnectionState" has incompatible type "Guild | None"; expected "Guild"  [arg-type]
- discord/state.py:1114: error: Argument 1 to "store_sticker" of "ConnectionState" has incompatible type "Guild | None"; expected "Guild"  [arg-type]
- discord/guild.py:3926: error: Item "datetime" of "Snowflake | datetime" has no attribute "id"  [union-attr]
- discord/client.py:2167: error: Item "datetime" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/client.py:2167: error: Item "None" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1787: error: Item "datetime" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1787: error: Item "None" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1789: error: Item "datetime" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1789: error: Item "None" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1793: error: Item "datetime" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1793: error: Item "None" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1797: error: Item "datetime" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]
- discord/abc.py:1797: error: Item "None" of "Snowflake | datetime | None" has no attribute "id"  [union-attr]

hydra-zen (https://github.com/mit-ll-responsible-ai/hydra-zen)
- src/hydra_zen/structured_configs/_implementations.py:3117: error: Argument 1 to "list" has incompatible type "list[str | DataClass_ | Mapping[str, str | Sequence[str] | None]] | None"; expected "Iterable[Any]"  [arg-type]

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Nice!

@ilevkivskyi ilevkivskyi merged commit 544e6ce into python:master Nov 4, 2023
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@ilevkivskyi ilevkivskyi deleted the fix-lambda-ctx-binder branch November 4, 2023 23:42
JukkaL pushed a commit that referenced this pull request Nov 10, 2023
Fixes #4297

Fix is straightforward: without properly pushing lambda expression on
the stack, the previous fix @JukkaL added for nested functions doesn't
work for lambdas (it thinks that we are at global scope).
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Narrowed down types sometimes not propagated to lambda
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