Fixed typing

Author: MomIsBestFriend

pandas/core/aggregation.py

@@ -5,13 +5,16 @@
 
 from collections import defaultdict
 from functools import partial
-from typing import Any, DefaultDict, List, Sequence, Tuple
+from typing import TYPE_CHECKING, Any, DefaultDict, Hashable, List, Sequence, Tuple
 
 from pandas.core.dtypes.common import is_dict_like, is_list_like
 
 import pandas.core.common as com
 from pandas.core.indexes.api import Index
 
+if TYPE_CHECKING:
+    import numpy as np
+
 
 def is_multi_agg_with_relabel(**kwargs) -> bool:
     """
@@ -39,7 +42,9 @@ def is_multi_agg_with_relabel(**kwargs) -> bool:
     )
 
 
-def normalize_keyword_aggregation(kwargs: dict) -> Tuple[dict, List[str], List[int]]:
+def normalize_keyword_aggregation(
+    kwargs: dict,
+) -> Tuple[DefaultDict, Tuple[Hashable], "np.ndarray"]:
     """
     Normalize user-provided "named aggregation" kwargs.
     Transforms from the new ``Mapping[str, NamedAgg]`` style kwargs
@@ -51,11 +56,11 @@ def normalize_keyword_aggregation(kwargs: dict) -> Tuple[dict, List[str], List[i
 
     Returns
     -------
-    aggspec : dict
+    aggspec : DefaultDict[list]
         The transformed kwargs.
-    columns : List[str]
+    columns : Tuple[Hashable]
         The user-provided keys.
-    col_idx_order : List[int]
+    col_idx_order : numpy.ndarray
         List of columns indices.
 
     Examples