From 7b0e246bc0fe363bd32c6c735ac964a83aed62bb Mon Sep 17 00:00:00 2001
From: jiawei-zhang-a <2992758051@qq.com>
Date: Wed, 26 Apr 2023 05:30:47 +0000
Subject: [PATCH 1/4] Metadata in DataFrame.meann

---
 pandas/core/frame.py                  | 7 ++++++-
 pandas/tests/generic/test_finalize.py | 1 -
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index 838a34adeaf82..feef2cf496bdd 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -11026,7 +11026,12 @@ def mean(
         numeric_only: bool = False,
         **kwargs,
     ):
-        return super().mean(axis, skipna, numeric_only, **kwargs)
+        result = super().mean(axis, skipna, numeric_only, **kwargs)
+        return (
+            result.__finalize__(self, method="mean")
+            if hasattr(result, "__finalize__")
+            else result
+        )
 
     @doc(make_doc("median", ndim=2))
     def median(
diff --git a/pandas/tests/generic/test_finalize.py b/pandas/tests/generic/test_finalize.py
index a76b6b94d719d..0db255dccd4dc 100644
--- a/pandas/tests/generic/test_finalize.py
+++ b/pandas/tests/generic/test_finalize.py
@@ -422,7 +422,6 @@
     ),
     pytest.param(
         (pd.DataFrame, frame_data, operator.methodcaller("mean")),
-        marks=not_implemented_mark,
     ),
 ]
 

From 58b46e2e9dc838e40f43d742736445ec4551ea77 Mon Sep 17 00:00:00 2001
From: jiawei-zhang-a <2992758051@qq.com>
Date: Wed, 26 Apr 2023 17:23:57 +0000
Subject: [PATCH 2/4] more specifically to skip for type np.float64

---
 pandas/core/frame.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index feef2cf496bdd..073772a01d9b2 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -11027,11 +11027,11 @@ def mean(
         **kwargs,
     ):
         result = super().mean(axis, skipna, numeric_only, **kwargs)
-        return (
-            result.__finalize__(self, method="mean")
-            if hasattr(result, "__finalize__")
-            else result
-        )
+
+        if isinstance(result, np.float64):
+            return result
+        else:
+            return result.__finalize__(self, method="mean")
 
     @doc(make_doc("median", ndim=2))
     def median(

From e842f9a8442d0eb954e5d395771d5d5f3570131f Mon Sep 17 00:00:00 2001
From: jiawei-zhang-a <2992758051@qq.com>
Date: Wed, 26 Apr 2023 21:32:20 +0000
Subject: [PATCH 3/4] only propogate when it is Dataframe of Series

---
 pandas/core/frame.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index 073772a01d9b2..2dbac10b00634 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -11028,10 +11028,10 @@ def mean(
     ):
         result = super().mean(axis, skipna, numeric_only, **kwargs)
 
-        if isinstance(result, np.float64):
-            return result
-        else:
+        if isinstance(result, (DataFrame, Series)):
             return result.__finalize__(self, method="mean")
+        else:
+            return result
 
     @doc(make_doc("median", ndim=2))
     def median(

From 312940b79fa882c3d78a977f764f7b91cb83b16f Mon Sep 17 00:00:00 2001
From: root <2992758051@qq.com>
Date: Fri, 28 Apr 2023 23:25:42 +0000
Subject: [PATCH 4/4] change the method of finalize

---
 pandas/core/frame.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index 2dbac10b00634..3092b5cbbc3cb 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -11029,7 +11029,7 @@ def mean(
         result = super().mean(axis, skipna, numeric_only, **kwargs)
 
         if isinstance(result, (DataFrame, Series)):
-            return result.__finalize__(self, method="mean")
+            return result.__finalize__(self)
         else:
             return result