From 344430304c2383d059d2077f20f915fed30eecf8 Mon Sep 17 00:00:00 2001
From: Illviljan <14371165+Illviljan@users.noreply.github.com>
Date: Sat, 12 Mar 2022 21:45:51 +0100
Subject: [PATCH 1/3] Run pyupgrade on core/groupby

---
 xarray/core/groupby.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xarray/core/groupby.py b/xarray/core/groupby.py
index dea8949b84f..f2beb653a21 100644
--- a/xarray/core/groupby.py
+++ b/xarray/core/groupby.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import datetime
 import warnings
 from typing import Any, Callable, Hashable, Sequence, Union

From aca4310de5847ce362a91abe75116eee225bde49 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Sat, 12 Mar 2022 20:47:47 +0000
Subject: [PATCH 2/3] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 xarray/core/groupby.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xarray/core/groupby.py b/xarray/core/groupby.py
index f2beb653a21..d12cb1eb19d 100644
--- a/xarray/core/groupby.py
+++ b/xarray/core/groupby.py
@@ -871,9 +871,9 @@ def _combine(self, applied, shortcut=False):
     def reduce(
         self,
         func: Callable[..., Any],
-        dim: Union[None, Hashable, Sequence[Hashable]] = None,
+        dim: None | Hashable | Sequence[Hashable] = None,
         *,
-        axis: Union[None, int, Sequence[int]] = None,
+        axis: None | int | Sequence[int] = None,
         keep_attrs: bool = None,
         keepdims: bool = False,
         shortcut: bool = True,
@@ -999,9 +999,9 @@ def _combine(self, applied):
     def reduce(
         self,
         func: Callable[..., Any],
-        dim: Union[None, Hashable, Sequence[Hashable]] = None,
+        dim: None | Hashable | Sequence[Hashable] = None,
         *,
-        axis: Union[None, int, Sequence[int]] = None,
+        axis: None | int | Sequence[int] = None,
         keep_attrs: bool = None,
         keepdims: bool = False,
         **kwargs: Any,

From a7afddce2a4ddea27beeb9ec785ff21ec5e7db2c Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Sat, 12 Mar 2022 20:52:19 +0000
Subject: [PATCH 3/3] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 xarray/core/groupby.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xarray/core/groupby.py b/xarray/core/groupby.py
index d12cb1eb19d..68db14c29be 100644
--- a/xarray/core/groupby.py
+++ b/xarray/core/groupby.py
@@ -2,7 +2,7 @@
 
 import datetime
 import warnings
-from typing import Any, Callable, Hashable, Sequence, Union
+from typing import Any, Callable, Hashable, Sequence
 
 import numpy as np
 import pandas as pd