From c36fe1e6aeff585a04235481591d89cfa1c1f6d3 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 28 Sep 2022 11:47:47 -0700
Subject: [PATCH 1/4] DEPR Enforce ewm.vol deprecation

---
 pandas/core/window/ewm.py       | 11 -----------
 pandas/tests/window/test_ewm.py |  8 --------
 2 files changed, 19 deletions(-)

diff --git a/pandas/core/window/ewm.py b/pandas/core/window/ewm.py
index 6fae119bffdf1..3dfe06bd195bd 100644
--- a/pandas/core/window/ewm.py
+++ b/pandas/core/window/ewm.py
@@ -677,17 +677,6 @@ def std(self, bias: bool = False, numeric_only: bool = False, *args, **kwargs):
             )
         return zsqrt(self.var(bias=bias, numeric_only=numeric_only, **kwargs))
 
-    def vol(self, bias: bool = False, *args, **kwargs):
-        warnings.warn(
-            (
-                "vol is deprecated will be removed in a future version. "
-                "Use std instead."
-            ),
-            FutureWarning,
-            stacklevel=find_stack_level(inspect.currentframe()),
-        )
-        return self.std(bias, *args, **kwargs)
-
     @doc(
         template_header,
         create_section_header("Parameters"),
diff --git a/pandas/tests/window/test_ewm.py b/pandas/tests/window/test_ewm.py
index b524eb5978fa0..5b8dc49ba019f 100644
--- a/pandas/tests/window/test_ewm.py
+++ b/pandas/tests/window/test_ewm.py
@@ -170,14 +170,6 @@ def test_ewm_getitem_attributes_retained(arg, adjust, ignore_na):
     assert result == expected
 
 
-def test_ewm_vol_deprecated():
-    ser = Series(range(1))
-    with tm.assert_produces_warning(FutureWarning):
-        result = ser.ewm(com=0.1).vol()
-    expected = ser.ewm(com=0.1).std()
-    tm.assert_series_equal(result, expected)
-
-
 def test_ewma_times_adjust_false_raises():
     # GH 40098
     with pytest.raises(

From ef0dac4517370b3e632d1e9c2d2d4d31513fa5f4 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 19 Oct 2022 16:37:24 -0700
Subject: [PATCH 2/4] add whatsnew note

---
 doc/source/whatsnew/v2.0.0.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/doc/source/whatsnew/v2.0.0.rst b/doc/source/whatsnew/v2.0.0.rst
index e57ba92267855..a38d3aec9a567 100644
--- a/doc/source/whatsnew/v2.0.0.rst
+++ b/doc/source/whatsnew/v2.0.0.rst
@@ -145,6 +145,7 @@ Deprecations
 Removal of prior version deprecations/changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 - Disallow passing non-round floats to :class:`Timestamp` with ``unit="M"`` or ``unit="Y"`` (:issue:`47266`)
+- Removed :meth:`core.window.ewm.ExponentialMovingWindow.vol` (:issue:`39220`)
 - Removed :func:`is_extension_type` in favor of :func:`is_extension_array_dtype` (:issue:`29457`)
 - Remove :meth:`DataFrameGroupBy.pad` and :meth:`DataFrameGroupBy.backfill` (:issue:`45076`)
 - Enforced :meth:`Rolling.count` with ``min_periods=None`` to default to the size of the window (:issue:`31302`)

From fb7e472580ee0f52511e9a70b255e0ee488c1428 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Fri, 21 Oct 2022 15:01:17 -0700
Subject: [PATCH 3/4] Remove reference to core

---
 doc/source/whatsnew/v2.0.0.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/whatsnew/v2.0.0.rst b/doc/source/whatsnew/v2.0.0.rst
index 0132cb4d5c697..0c89d5d0f2d2f 100644
--- a/doc/source/whatsnew/v2.0.0.rst
+++ b/doc/source/whatsnew/v2.0.0.rst
@@ -186,7 +186,7 @@ Removal of prior version deprecations/changes
 - Removed deprecated :meth:`Timedelta.delta`, :meth:`Timedelta.is_populated`, and :attr:`Timedelta.freq` (:issue:`46430`, :issue:`46476`)
 - Removed the ``numeric_only`` keyword from :meth:`Categorical.min` and :meth:`Categorical.max` in favor of ``skipna`` (:issue:`48821`)
 - Removed :func:`is_extension_type` in favor of :func:`is_extension_array_dtype` (:issue:`29457`)
-- Removed :meth:`core.window.ewm.ExponentialMovingWindow.vol` (:issue:`39220`)
+- Removed ``.ExponentialMovingWindow.vol`` (:issue:`39220`)
 - Removed :meth:`Index.get_value` (:issue:`33907`)
 - Remove :meth:`DataFrameGroupBy.pad` and :meth:`DataFrameGroupBy.backfill` (:issue:`45076`)
 - Remove ``numpy`` argument from :func:`read_json` (:issue:`30636`)

From 4194feac1e511c0ce2333a3a817cc05cebac2c1a Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Mon, 24 Oct 2022 14:53:58 -0700
Subject: [PATCH 4/4] Remove unused imports

---
 pandas/core/window/ewm.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/pandas/core/window/ewm.py b/pandas/core/window/ewm.py
index 5e78e3a6d53c9..9e5437a084695 100644
--- a/pandas/core/window/ewm.py
+++ b/pandas/core/window/ewm.py
@@ -4,7 +4,6 @@
 from functools import partial
 from textwrap import dedent
 from typing import TYPE_CHECKING
-import warnings
 
 import numpy as np
 
@@ -21,7 +20,6 @@
 
 from pandas.compat.numpy import function as nv
 from pandas.util._decorators import doc
-from pandas.util._exceptions import find_stack_level
 
 from pandas.core.dtypes.common import (
     is_datetime64_ns_dtype,