From d419fb882356cb83c30a9c5e6bc31dedad3e5a27 Mon Sep 17 00:00:00 2001
From: Deepak Cherian <deepak@cherian.net>
Date: Fri, 16 Aug 2024 10:30:13 -0600
Subject: [PATCH] Cleanup

---
 xarray/core/groupby.py | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/xarray/core/groupby.py b/xarray/core/groupby.py
index 0a239b8cae1..54806988205 100644
--- a/xarray/core/groupby.py
+++ b/xarray/core/groupby.py
@@ -475,15 +475,12 @@ class GroupBy(Generic[T_Xarray]):
     """
 
     __slots__ = (
-        "_inserted_dims",
-        "_group",
         "_group_dim",
-        "_group_indices",
-        "_groups",
         "groupers",
         "_obj",
         "_restore_coord_dims",
-        "_stacked_dim",
+        # cached properties
+        "_groups",
         "_dims",
         "_sizes",
         "_len",
@@ -494,7 +491,6 @@ class GroupBy(Generic[T_Xarray]):
         "group1d",
         "_stacked_dim",
         "_inserted_dims",
-        "coords",
         "encoded",
     )
     _obj: T_Xarray
@@ -509,15 +505,13 @@ class GroupBy(Generic[T_Xarray]):
     _groups: dict[GroupKey, GroupIndex] | None
     _dims: tuple[Hashable, ...] | Frozen[Hashable, int] | None
     _sizes: Mapping[Hashable, int] | None
+    _len: int
 
     # _ensure_1d:
     group1d: T_Group
     _stacked_dim: Hashable | None
     _inserted_dims: list[Hashable]
 
-    _unique_coord: Variable | _DummyGroup
-    coords: Coordinates
-
     encoded: EncodedGroups
 
     def __init__(