Backport PR #51627 on branch 2.0.x (BUG: Change default of group_keys to True) (#51632)

Backport PR #51627: BUG: Change default of group_keys to True

Co-authored-by: Richard Shadrach <[email protected]>

Author: meeseeksmachine

pandas/core/frame.py

@@ -8208,7 +8208,7 @@ def groupby(
         level: IndexLabel | None = None,
         as_index: bool = True,
         sort: bool = True,
-        group_keys: bool | lib.NoDefault = no_default,
+        group_keys: bool = True,
         observed: bool = False,
         dropna: bool = True,
     ) -> DataFrameGroupBy:

pandas/core/series.py

@@ -2002,7 +2002,7 @@ def groupby(
         level: IndexLabel = None,
         as_index: bool = True,
         sort: bool = True,
-        group_keys: bool | lib.NoDefault = no_default,
+        group_keys: bool = True,
         observed: bool = False,
         dropna: bool = True,
     ) -> SeriesGroupBy: