Run Pyrefly on pandas-stubs in CI

.github/workflows/test.yml

@@ -38,6 +38,9 @@ jobs:
       - name: Run ty on 'pandas-stubs' (using the local stubs) and on the local stubs
         run: poetry run poe ty
 
+      - name: Run pyrefly on the local stubs
+        run: poetry run poe pyrefly
+
       - name: Run pyright on 'tests' (using the local stubs) and on the local stubs
         run: poetry run poe pyright
 

pandas-stubs/_libs/tslibs/timestamps.pyi

@@ -105,7 +105,7 @@ class Timestamp(datetime, SupportsIndex):
 
     if sys.version_info >= (3, 12):
         @classmethod
-        def fromtimestamp(  # pyright: ignore[reportIncompatibleMethodOverride]
+        def fromtimestamp(  # pyright: ignore[reportIncompatibleMethodOverride]  # pyrefly: ignore
             cls, t: float, tz: _tzinfo | str | None = ...
         ) -> Self: ...
     else:
@@ -143,7 +143,7 @@ class Timestamp(datetime, SupportsIndex):
     # Override since fold is more precise than datetime.replace(fold:int)
     # Here it is restricted to be 0 or 1 using a Literal
     # Violation of Liskov substitution principle
-    def replace(  # type:ignore[override] # pyright: ignore[reportIncompatibleMethodOverride]
+    def replace(  # type:ignore[override] # pyright: ignore[reportIncompatibleMethodOverride] # pyrefly: ignore
         self,
         year: int | None = ...,
         month: int | None = ...,

pandas-stubs/core/arrays/datetimelike.pyi

@@ -50,7 +50,7 @@ class DatetimeLikeArrayMixin(ExtensionOpsMixin, ExtensionArray):
     @property
     def shape(self): ...
     def reshape(self, *args, **kwargs): ...
-    def ravel(self, *args, **kwargs): ...
+    def ravel(self, *args, **kwargs): ...  # pyrefly: ignore
     def __iter__(self): ...
     @property
     def asi8(self) -> np.ndarray: ...
@@ -76,7 +76,7 @@ class DatetimeLikeArrayMixin(ExtensionOpsMixin, ExtensionArray):
     def copy(self): ...
     def shift(self, periods: int = ..., fill_value=..., axis: int = ...): ...
     def searchsorted(self, value, side: str = ..., sorter=...): ...
-    def repeat(self, repeats, *args, **kwargs): ...
+    def repeat(self, repeats, *args, **kwargs): ...  # pyrefly: ignore
     def value_counts(self, dropna: bool = ...): ...
     def map(self, mapper): ...
     def isna(self): ...

pandas-stubs/core/groupby/generic.pyi

@@ -58,7 +58,7 @@ class NamedAgg(NamedTuple):
 
 class SeriesGroupBy(GroupBy[Series[S2]], Generic[S2, ByT]):
     @overload
-    def aggregate(
+    def aggregate(  # pyrefly: ignore
         self,
         func: Callable[Concatenate[Series[S2], P], S3],
         /,

pandas-stubs/core/indexes/multi.pyi

@@ -73,7 +73,7 @@ class MultiIndex(Index):
     @property
     def codes(self): ...
     def set_codes(self, codes, *, level=..., verify_integrity: bool = ...): ...
-    def copy(  # pyright: ignore[reportIncompatibleMethodOverride]
+    def copy(  # pyright: ignore[reportIncompatibleMethodOverride] # pyrefly: ignore
         self, names=..., deep: bool = ...
     ) -> Self: ...
     def __array__(self, dtype=...) -> np.ndarray: ...
@@ -107,7 +107,7 @@ class MultiIndex(Index):
     def dropna(self, how: AnyAll = ...) -> Self: ...
     def get_level_values(self, level: str | int) -> Index: ...
     def unique(self, level=...): ...
-    def to_frame(
+    def to_frame(  # pyrefly: ignore
         self,
         index: bool = ...,
         name: list[HashableT] = ...,
@@ -153,7 +153,7 @@ class MultiIndex(Index):
     def truncate(self, before=..., after=...): ...
     def equals(self, other) -> bool: ...
     def equal_levels(self, other): ...
-    def union(self, other, sort=...): ...
+    def union(self, other, sort=...): ...  # pyrefly: ignore
     def intersection(  # pyright: ignore[reportIncompatibleMethodOverride]
         self, other: list | Self, sort: bool = ...
     ): ...

pandas-stubs/core/indexes/range.pyi

@@ -72,7 +72,7 @@ class RangeIndex(Index[int]):
     def __floordiv__(self, other): ...
     def all(self) -> bool: ...
     def any(self) -> bool: ...
-    def union(
+    def union(  # pyrefly: ignore
         self, other: list[HashableT] | Index, sort=...
     ) -> Index | Index[int] | RangeIndex: ...
     @overload  # type: ignore[override]

pandas-stubs/core/indexing.pyi

@@ -16,7 +16,9 @@ _IndexSliceTuple: TypeAlias = tuple[
 
 _IndexSliceUnion: TypeAlias = slice | _IndexSliceTuple
 
-_IndexSliceUnionT = TypeVar("_IndexSliceUnionT", bound=_IndexSliceUnion)
+_IndexSliceUnionT = TypeVar(
+    "_IndexSliceUnionT", bound=_IndexSliceUnion  # pyrefly: ignore
+)
 
 class _IndexSlice:
     def __getitem__(self, arg: _IndexSliceUnionT) -> _IndexSliceUnionT: ...

pandas-stubs/core/resample.pyi

@@ -62,7 +62,7 @@ _SeriesGroupByFuncArgs: TypeAlias = (
 )
 
 class Resampler(BaseGroupBy[NDFrameT]):
-    grouper: BinGrouper  # pyright: ignore[reportIncompatibleVariableOverride]  # variance incompatibility
+    grouper: BinGrouper  # pyright: ignore[reportIncompatibleVariableOverride]  # pyrefly: ignore  # variance incompatibility
     binner: DatetimeIndex | TimedeltaIndex | PeriodIndex
     exclusions: frozenset[Hashable]
     ax: Index

pandas-stubs/core/series.pyi

@@ -1554,7 +1554,7 @@ class Series(IndexOpsMixin[S1], NDFrame):
     def first_valid_index(self) -> Scalar: ...
     def last_valid_index(self) -> Scalar: ...
     @overload
-    def value_counts(
+    def value_counts(  # pyrefly: ignore
         self,
         normalize: Literal[False] = ...,
         sort: _bool = ...,

pandas-stubs/core/window/ewm.pyi

@@ -54,7 +54,7 @@ class ExponentialMovingWindowGroupby(
 class OnlineExponentialMovingWindow(ExponentialMovingWindow[NDFrameT]):
     def reset(self) -> None: ...
     def aggregate(self, func, *args, **kwargs): ...
-    def std(self, bias: bool = ..., *args, **kwargs): ...
+    def std(self, bias: bool = ..., *args, **kwargs): ...  # pyrefly: ignore
     def corr(
         self,
         other: DataFrame | Series | None = ...,
@@ -69,6 +69,6 @@ class OnlineExponentialMovingWindow(ExponentialMovingWindow[NDFrameT]):
         numeric_only: bool = ...,
     ): ...
     def var(self, bias: bool = ..., numeric_only: bool = ...): ...
-    def mean(
+    def mean(  # pyrefly: ignore
         self, *args, update: NDFrameT | None = ..., update_times: None = ..., **kwargs
     ) -> NDFrameT: ...

pyproject.toml

@@ -34,6 +34,7 @@ python = ">=3.10"
 types-pytz = ">= 2022.1.1"
 numpy = ">= 1.23.5"
 ty = "^0.0.1a8"
+pyrefly = "^0.21.0"
 
 [tool.poetry.group.dev.dependencies]
 mypy = "1.16.0"
@@ -108,6 +109,10 @@ script = "scripts.test:test(dist=True, type_checker='mypy')"
 help = "Run ty on pandas-stubs"
 script = "scripts.test.run:ty"
 
+[tool.poe.tasks.pyrefly]
+help = "Run pyrefly on pandas-stubs"
+script = "scripts.test.run:pyrefly"
+
 [tool.poe.tasks.pyright]
 help = "Run pyright on 'tests' (using the local stubs) and on the local stubs"
 script = "scripts.test.run:pyright_src"

scripts/test/_step.py

@@ -9,6 +9,10 @@
     name="Run ty on 'pandas-stubs' (using the local stubs) and on the local stubs",
     run=run.ty,
 )
+pyrefly_src = Step(
+    name="Run pyrefly on the local stubs",
+    run=run.pyrefly,
+)
 pyright_src = Step(
     name="Run pyright on 'tests' (using the local stubs) and on the local stubs",
     run=run.pyright_src,

scripts/test/run.py

@@ -156,3 +156,8 @@ def released_mypy():
 def ty():
     cmd = ["ty", "check", "pandas-stubs"]
     subprocess.run(cmd, check=True)
+
+
+def pyrefly():
+    cmd = ["pyrefly", "check", "pandas-stubs"]
+    subprocess.run(cmd, check=True)