TYP: Fix typing issues, mainly Something => IndexLabel

Author: behrenhoff

pandas/core/frame.py

@@ -6956,7 +6956,7 @@ def sort_index(
 
     def value_counts(
         self,
-        subset: Sequence[Hashable] | None = None,
+        subset: IndexLabel | None = None,
         normalize: bool = False,
         sort: bool = True,
         ascending: bool = False,
@@ -7081,7 +7081,7 @@ def value_counts(
             counts /= counts.sum()
 
         # Force MultiIndex for single column
-        if is_list_like(subset) and len(subset) == 1:
+        if len(counts.index.names) == 1:
             counts.index = MultiIndex.from_arrays(
                 [counts.index], names=[counts.index.name]
             )
@@ -7375,7 +7375,7 @@ def swaplevel(self, i: Axis = -2, j: Axis = -1, axis: Axis = 0) -> DataFrame:
             result.columns = result.columns.swaplevel(i, j)
         return result
 
-    def reorder_levels(self, order: Sequence[int | str], axis: Axis = 0) -> DataFrame:
+    def reorder_levels(self, order: Sequence[Hashable], axis: Axis = 0) -> DataFrame:
         """
         Rearrange index levels using input order. May not drop or duplicate levels.
 
@@ -8991,7 +8991,7 @@ def pivot_table(
             sort=sort,
         )
 
-    def stack(self, level: Level = -1, dropna: bool = True, sort: bool = True):
+    def stack(self, level: IndexLabel = -1, dropna: bool = True, sort: bool = True):
         """
         Stack the prescribed level(s) from columns to index.
 
@@ -9296,7 +9296,7 @@ def explode(
 
         return result.__finalize__(self, method="explode")
 
-    def unstack(self, level: Level = -1, fill_value=None):
+    def unstack(self, level: IndexLabel = -1, fill_value=None):
         """
         Pivot a level of the (necessarily hierarchical) index labels.