Fix type extraction from isinstance checks
#19223
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…ng the underlying type
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Diff from mypy_primer, showing the effect of this PR on open source code: antidote (https://github.com/Finistere/antidote): 1.44x slower (63.3s -> 91.3s in single noisy sample)
ibis (https://github.com/ibis-project/ibis)
- ibis/formats/pandas.py:71: error: Incompatible types in assignment (expression has type "list[float]", variable has type "Series[Any] | Iterable[tuple[str, dtype[Any] | ExtensionDtype]]") [assignment]
- ibis/legacy/udf/vectorized.py:174: error: Argument 1 to "len" has incompatible type "float"; expected "Sized" [arg-type]
pandas (https://github.com/pandas-dev/pandas)
+ pandas/core/algorithms.py:219: error: Unused "type: ignore" comment [unused-ignore]
+ pandas/core/arrays/datetimes.py:334: error: Unused "type: ignore" comment [unused-ignore]
materialize (https://github.com/MaterializeInc/materialize): 1.06x slower (132.1s -> 139.8s in single noisy sample)
janus (https://github.com/aio-libs/janus): 7.79x slower (0.9s -> 6.8s in single noisy sample)
mypy (https://github.com/python/mypy): 1.07x slower (94.5s -> 101.3s in single noisy sample)
spark (https://github.com/apache/spark)
- python/pyspark/pandas/typedef/typehints.py:670: error: Incompatible types in assignment (expression has type "type[float64] | Any", variable has type "type[NameTypeHolder]") [assignment]
- python/pyspark/pandas/typedef/typehints.py:834: error: Incompatible types in assignment (expression has type "type[float64] | Any", variable has type "None") [assignment]
+ python/pyspark/pandas/typedef/typehints.py:834: error: Incompatible types in assignment (expression has type "type[Any] | Any", variable has type "None") [assignment]
- python/pyspark/pandas/typedef/typehints.py:847: error: Incompatible types in assignment (expression has type "type[float64] | Any", variable has type "None") [assignment]
+ python/pyspark/pandas/typedef/typehints.py:847: error: Incompatible types in assignment (expression has type "type[Any] | Any", variable has type "None") [assignment]
imagehash (https://github.com/JohannesBuchner/imagehash): 1.06x slower (79.2s -> 84.3s in single noisy sample)
discord.py (https://github.com/Rapptz/discord.py): 1.08x faster (299.0s -> 276.0s in single noisy sample)
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Primer hits look correct, that's a few more false positives fixed. |
JukkaL
approved these changes
Jun 5, 2025
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Fixes #19221. Instead of trying to use the first (maybe) overload item and erase it, just use the underlying type with Any-filled typevars