add limit_area parameter in ffill and bfill methods

Author: hyperc54

pandas-stubs/core/frame.pyi

@@ -1656,6 +1656,7 @@ class DataFrame(NDFrame, OpsMixin):
         axis: Axis | None = ...,
         inplace: Literal[True],
         limit: int | None = ...,
+        limit_area: Literal["inside", "outside"] | None = ...,
         downcast: dict | None = ...,
     ) -> None: ...
     @overload
@@ -1665,6 +1666,7 @@ class DataFrame(NDFrame, OpsMixin):
         axis: Axis | None = ...,
         inplace: Literal[False] = ...,
         limit: int | None = ...,
+        limit_area: Literal["inside", "outside"] | None = ...,
         downcast: dict | None = ...,
     ) -> DataFrame: ...
     def clip(
@@ -1736,6 +1738,7 @@ class DataFrame(NDFrame, OpsMixin):
         axis: Axis | None = ...,
         inplace: Literal[True],
         limit: int | None = ...,
+        limit_area: Literal["inside", "outside"] | None = ...,
         downcast: dict | None = ...,
     ) -> None: ...
     @overload
@@ -1745,6 +1748,7 @@ class DataFrame(NDFrame, OpsMixin):
         axis: Axis | None = ...,
         inplace: Literal[False] = ...,
         limit: int | None = ...,
+        limit_area: Literal["inside", "outside"] | None = ...,
         downcast: dict | None = ...,
     ) -> DataFrame: ...
     def filter(

tests/test_frame.py

@@ -2328,15 +2328,25 @@ def test_types_ffill() -> None:
     df = pd.DataFrame([[1, 2, 3]])
     check(assert_type(df.ffill(), pd.DataFrame), pd.DataFrame)
     check(assert_type(df.ffill(inplace=False), pd.DataFrame), pd.DataFrame)
+    check(
+        assert_type(df.ffill(inplace=False, limit_area="inside"), pd.DataFrame),
+        pd.DataFrame,
+    )
     assert assert_type(df.ffill(inplace=True), None) is None
+    assert assert_type(df.ffill(inplace=True, limit_area="outside"), None) is None
 
 
 def test_types_bfill() -> None:
     # GH 44
     df = pd.DataFrame([[1, 2, 3]])
     check(assert_type(df.bfill(), pd.DataFrame), pd.DataFrame)
     check(assert_type(df.bfill(inplace=False), pd.DataFrame), pd.DataFrame)
+    check(
+        assert_type(df.bfill(inplace=False, limit_area="inside"), pd.DataFrame),
+        pd.DataFrame,
+    )
     assert assert_type(df.bfill(inplace=True), None) is None
+    assert assert_type(df.bfill(inplace=True, limit_area="outside"), None) is None
 
 
 def test_types_replace() -> None: