From f3cf0561179f029981a9f74744254f872923fb7f Mon Sep 17 00:00:00 2001
From: Brock <jbrockmendel@gmail.com>
Date: Fri, 3 Feb 2023 09:54:59 -0800
Subject: [PATCH 1/2] REF: remove _GroupByMixin._shallow_copy

---
 pandas/core/resample.py | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/pandas/core/resample.py b/pandas/core/resample.py
index d3b3c844e8c4e..007d70c252159 100644
--- a/pandas/core/resample.py
+++ b/pandas/core/resample.py
@@ -170,18 +170,6 @@ def __init__(
         else:
             self.exclusions = frozenset()
 
-    @final
-    def _shallow_copy(self, obj, **kwargs):
-        """
-        return a new object with the replacement attributes
-        """
-        if isinstance(obj, self._constructor):
-            obj = obj.obj
-        for attr in self._attributes:
-            if attr not in kwargs:
-                kwargs[attr] = getattr(self, attr)
-        return self._constructor(obj, **kwargs)
-
     def __str__(self) -> str:
         """
         Provide a nice str repr of our rolling object.
@@ -1178,7 +1166,7 @@ def _apply(self, f, *args, **kwargs):
         """
 
         def func(x):
-            x = self._shallow_copy(x, groupby=self.groupby)
+            x = self._resampler_cls(x, groupby=self.groupby)
 
             if isinstance(f, str):
                 return getattr(x, f)(**kwargs)
@@ -1361,7 +1349,7 @@ class DatetimeIndexResamplerGroupby(_GroupByMixin, DatetimeIndexResampler):
     """
 
     @property
-    def _constructor(self):
+    def _resampler_cls(self):
         return DatetimeIndexResampler
 
 
@@ -1473,7 +1461,7 @@ class PeriodIndexResamplerGroupby(_GroupByMixin, PeriodIndexResampler):
     """
 
     @property
-    def _constructor(self):
+    def _resampler_cls(self):
         return PeriodIndexResampler
 
 
@@ -1501,7 +1489,7 @@ class TimedeltaIndexResamplerGroupby(_GroupByMixin, TimedeltaIndexResampler):
     """
 
     @property
-    def _constructor(self):
+    def _resampler_cls(self):
         return TimedeltaIndexResampler
 
 

From 5f772d0b8c67b1c572137caaa627d5b503cda58f Mon Sep 17 00:00:00 2001
From: Brock <jbrockmendel@gmail.com>
Date: Fri, 3 Feb 2023 10:51:50 -0800
Subject: [PATCH 2/2] dont pass ignored-kwargs to Resampler

---
 pandas/core/resample.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/pandas/core/resample.py b/pandas/core/resample.py
index 007d70c252159..18e47b095bea7 100644
--- a/pandas/core/resample.py
+++ b/pandas/core/resample.py
@@ -150,7 +150,6 @@ def __init__(
         *,
         group_keys: bool | lib.NoDefault = lib.no_default,
         selection=None,
-        **kwargs,
     ) -> None:
         self.groupby = groupby
         self.keys = None