From a0e56291cb650e3a629680feb396765dc1179cff Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 00:19:10 +0800
Subject: [PATCH 01/26] Update v1.5.0.rst

---
 doc/source/whatsnew/v1.5.0.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/whatsnew/v1.5.0.rst b/doc/source/whatsnew/v1.5.0.rst
index 8dac952874f89..eaea367f25d01 100644
--- a/doc/source/whatsnew/v1.5.0.rst
+++ b/doc/source/whatsnew/v1.5.0.rst
@@ -297,7 +297,7 @@ Other Deprecations
 - Deprecated the ``warn`` parameter in :func:`infer_freq` (:issue:`45947`)
 - Deprecated allowing non-keyword arguments in :meth:`ExtensionArray.argsort` (:issue:`46134`)
 - Deprecated treating all-bool ``object``-dtype columns as bool-like in :meth:`DataFrame.any` and :meth:`DataFrame.all` with ``bool_only=True``, explicitly cast to bool instead (:issue:`46188`)
--
+- Deprecated the ``closed`` argument in :meth:`interval_range` in favor of ``inclusive`` argument; In a future version passing ``closed`` will raise (:issue:`40245`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_150.performance:

From b7c833c7f18c06a1373c35e886baebfa9ca25b6a Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 00:21:06 +0800
Subject: [PATCH 02/26] Update interval.py

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

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index c1d7eb972e1f4..1bc7578dadd46 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -954,7 +954,7 @@ def interval_range(
     periods=None,
     freq=None,
     name: Hashable = None,
-    closed: IntervalClosedType = "right",
+    inclusive: IntervalClosedType = "right",
 ) -> IntervalIndex:
     """
     Return a fixed frequency IntervalIndex.
@@ -973,7 +973,7 @@ def interval_range(
         for numeric and 'D' for datetime-like.
     name : str, default None
         Name of the resulting IntervalIndex.
-    closed : {'left', 'right', 'both', 'neither'}, default 'right'
+    inclusive : {'left', 'right', 'both', 'neither'}, default 'right'
         Whether the intervals are closed on the left-side, right-side, both
         or neither.
 
@@ -1035,10 +1035,10 @@ def interval_range(
     IntervalIndex([(0.0, 1.5], (1.5, 3.0], (3.0, 4.5], (4.5, 6.0]],
               dtype='interval[float64, right]')
 
-    The ``closed`` parameter specifies which endpoints of the individual
+    The ``inclusive`` parameter specifies which endpoints of the individual
     intervals within the ``IntervalIndex`` are closed.
 
-    >>> pd.interval_range(end=5, periods=4, closed='both')
+    >>> pd.interval_range(end=5, periods=4, inclusive='both')
     IntervalIndex([[1, 2], [2, 3], [3, 4], [4, 5]],
                   dtype='interval[int64, both]')
     """
@@ -1118,4 +1118,4 @@ def interval_range(
         else:
             breaks = timedelta_range(start=start, end=end, periods=periods, freq=freq)
 
-    return IntervalIndex.from_breaks(breaks, name=name, closed=closed)
+    return IntervalIndex.from_breaks(breaks, name=name, closed=inclusive)

From 80120b7ab4fc233c398bfa3f2ee7e2685964d659 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 00:22:17 +0800
Subject: [PATCH 03/26] pre commit

---
 pandas/tests/indexes/interval/test_astype.py  |  7 +++---
 .../tests/indexes/interval/test_interval.py   | 12 +++++-----
 .../indexes/interval/test_interval_range.py   | 24 +++++++++----------
 pandas/tests/indexes/interval/test_setops.py  |  2 +-
 pandas/tests/indexing/test_coercion.py        |  2 +-
 pandas/tests/indexing/test_loc.py             |  4 ++--
 .../util/test_assert_interval_array_equal.py  |  7 +++---
 7 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/pandas/tests/indexes/interval/test_astype.py b/pandas/tests/indexes/interval/test_astype.py
index c253a745ef5a2..d9abc323d1442 100644
--- a/pandas/tests/indexes/interval/test_astype.py
+++ b/pandas/tests/indexes/interval/test_astype.py
@@ -133,7 +133,7 @@ class TestFloatSubtype(AstypeTests):
     """Tests specific to IntervalIndex with float subtype"""
 
     indexes = [
-        interval_range(-10.0, 10.0, closed="neither"),
+        interval_range(-10.0, 10.0, inclusive="neither"),
         IntervalIndex.from_arrays(
             [-1.5, np.nan, 0.0, 0.0, 1.5], [-0.5, np.nan, 1.0, 1.0, 3.0], closed="both"
         ),
@@ -161,6 +161,7 @@ def test_subtype_integer(self, subtype):
     @pytest.mark.parametrize("subtype", ["int64", "uint64"])
     def test_subtype_integer_with_non_integer_borders(self, subtype):
         index = interval_range(0.0, 3.0, freq=0.25)
+
         dtype = IntervalDtype(subtype, "right")
         result = index.astype(dtype)
         expected = IntervalIndex.from_arrays(
@@ -191,10 +192,10 @@ class TestDatetimelikeSubtype(AstypeTests):
     """Tests specific to IntervalIndex with datetime-like subtype"""
 
     indexes = [
-        interval_range(Timestamp("2018-01-01"), periods=10, closed="neither"),
+        interval_range(Timestamp("2018-01-01"), periods=10, inclusive="neither"),
         interval_range(Timestamp("2018-01-01"), periods=10).insert(2, NaT),
         interval_range(Timestamp("2018-01-01", tz="US/Eastern"), periods=10),
-        interval_range(Timedelta("0 days"), periods=10, closed="both"),
+        interval_range(Timedelta("0 days"), periods=10, inclusive="both"),
         interval_range(Timedelta("0 days"), periods=10).insert(2, NaT),
     ]
 
diff --git a/pandas/tests/indexes/interval/test_interval.py b/pandas/tests/indexes/interval/test_interval.py
index 37c13c37d070b..8880cab2ce29b 100644
--- a/pandas/tests/indexes/interval/test_interval.py
+++ b/pandas/tests/indexes/interval/test_interval.py
@@ -167,10 +167,10 @@ def test_delete(self, closed):
     @pytest.mark.parametrize(
         "data",
         [
-            interval_range(0, periods=10, closed="neither"),
-            interval_range(1.7, periods=8, freq=2.5, closed="both"),
-            interval_range(Timestamp("20170101"), periods=12, closed="left"),
-            interval_range(Timedelta("1 day"), periods=6, closed="right"),
+            interval_range(0, periods=10, inclusive="neither"),
+            interval_range(1.7, periods=8, freq=2.5, inclusive="both"),
+            interval_range(Timestamp("20170101"), periods=12, inclusive="left"),
+            interval_range(Timedelta("1 day"), periods=6, inclusive="right"),
         ],
     )
     def test_insert(self, data):
@@ -868,9 +868,9 @@ def test_nbytes(self):
     @pytest.mark.parametrize("new_closed", ["left", "right", "both", "neither"])
     def test_set_closed(self, name, closed, new_closed):
         # GH 21670
-        index = interval_range(0, 5, closed=closed, name=name)
+        index = interval_range(0, 5, inclusive=closed, name=name)
         result = index.set_closed(new_closed)
-        expected = interval_range(0, 5, closed=new_closed, name=name)
+        expected = interval_range(0, 5, inclusive=new_closed, name=name)
         tm.assert_index_equal(result, expected)
 
     @pytest.mark.parametrize("bad_closed", ["foo", 10, "LEFT", True, False])
diff --git a/pandas/tests/indexes/interval/test_interval_range.py b/pandas/tests/indexes/interval/test_interval_range.py
index 2f28c33a3bbc6..e0af6047dbae5 100644
--- a/pandas/tests/indexes/interval/test_interval_range.py
+++ b/pandas/tests/indexes/interval/test_interval_range.py
@@ -34,25 +34,25 @@ def test_constructor_numeric(self, closed, name, freq, periods):
 
         # defined from start/end/freq
         result = interval_range(
-            start=start, end=end, freq=freq, name=name, closed=closed
+            start=start, end=end, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # defined from start/periods/freq
         result = interval_range(
-            start=start, periods=periods, freq=freq, name=name, closed=closed
+            start=start, periods=periods, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # defined from end/periods/freq
         result = interval_range(
-            end=end, periods=periods, freq=freq, name=name, closed=closed
+            end=end, periods=periods, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # GH 20976: linspace behavior defined from start/end/periods
         result = interval_range(
-            start=start, end=end, periods=periods, name=name, closed=closed
+            start=start, end=end, periods=periods, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
@@ -67,19 +67,19 @@ def test_constructor_timestamp(self, closed, name, freq, periods, tz):
 
         # defined from start/end/freq
         result = interval_range(
-            start=start, end=end, freq=freq, name=name, closed=closed
+            start=start, end=end, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # defined from start/periods/freq
         result = interval_range(
-            start=start, periods=periods, freq=freq, name=name, closed=closed
+            start=start, periods=periods, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # defined from end/periods/freq
         result = interval_range(
-            end=end, periods=periods, freq=freq, name=name, closed=closed
+            end=end, periods=periods, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
@@ -88,7 +88,7 @@ def test_constructor_timestamp(self, closed, name, freq, periods, tz):
             # matches expected only for non-anchored offsets and tz naive
             # (anchored/DST transitions cause unequal spacing in expected)
             result = interval_range(
-                start=start, end=end, periods=periods, name=name, closed=closed
+                start=start, end=end, periods=periods, name=name, inclusive=closed
             )
             tm.assert_index_equal(result, expected)
 
@@ -102,25 +102,25 @@ def test_constructor_timedelta(self, closed, name, freq, periods):
 
         # defined from start/end/freq
         result = interval_range(
-            start=start, end=end, freq=freq, name=name, closed=closed
+            start=start, end=end, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # defined from start/periods/freq
         result = interval_range(
-            start=start, periods=periods, freq=freq, name=name, closed=closed
+            start=start, periods=periods, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # defined from end/periods/freq
         result = interval_range(
-            end=end, periods=periods, freq=freq, name=name, closed=closed
+            end=end, periods=periods, freq=freq, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
         # GH 20976: linspace behavior defined from start/end/periods
         result = interval_range(
-            start=start, end=end, periods=periods, name=name, closed=closed
+            start=start, end=end, periods=periods, name=name, inclusive=closed
         )
         tm.assert_index_equal(result, expected)
 
diff --git a/pandas/tests/indexes/interval/test_setops.py b/pandas/tests/indexes/interval/test_setops.py
index 059b0b75f4190..51a1d36398aa4 100644
--- a/pandas/tests/indexes/interval/test_setops.py
+++ b/pandas/tests/indexes/interval/test_setops.py
@@ -194,7 +194,7 @@ def test_set_incompatible_types(self, closed, op_name, sort):
             tm.assert_index_equal(result, expected)
 
         # GH 19016: incompatible dtypes -> cast to object
-        other = interval_range(Timestamp("20180101"), periods=9, closed=closed)
+        other = interval_range(Timestamp("20180101"), periods=9, inclusive=closed)
         expected = getattr(index.astype(object), op_name)(other, sort=sort)
         if op_name == "difference":
             expected = index
diff --git a/pandas/tests/indexing/test_coercion.py b/pandas/tests/indexing/test_coercion.py
index 2d54a9ba370ca..4504c55698a9a 100644
--- a/pandas/tests/indexing/test_coercion.py
+++ b/pandas/tests/indexing/test_coercion.py
@@ -709,7 +709,7 @@ def test_fillna_datetime64tz(self, index_or_series, fill_val, fill_dtype):
         ],
     )
     def test_fillna_interval(self, index_or_series, fill_val):
-        ii = pd.interval_range(1.0, 5.0, closed="right").insert(1, np.nan)
+        ii = pd.interval_range(1.0, 5.0, inclusive="right").insert(1, np.nan)
         assert isinstance(ii.dtype, pd.IntervalDtype)
         obj = index_or_series(ii)
 
diff --git a/pandas/tests/indexing/test_loc.py b/pandas/tests/indexing/test_loc.py
index 4702b5e5c4504..3f8e4401808b7 100644
--- a/pandas/tests/indexing/test_loc.py
+++ b/pandas/tests/indexing/test_loc.py
@@ -1508,12 +1508,12 @@ def test_loc_getitem_interval_index(self):
 
     def test_loc_getitem_interval_index2(self):
         # GH#19977
-        index = pd.interval_range(start=0, periods=3, closed="both")
+        index = pd.interval_range(start=0, periods=3, inclusive="both")
         df = DataFrame(
             [[1, 2, 3], [4, 5, 6], [7, 8, 9]], index=index, columns=["A", "B", "C"]
         )
 
-        index_exp = pd.interval_range(start=0, periods=2, freq=1, closed="both")
+        index_exp = pd.interval_range(start=0, periods=2, freq=1, inclusive="both")
         expected = Series([1, 4], index=index_exp, name="A")
         result = df.loc[1, "A"]
         tm.assert_series_equal(result, expected)
diff --git a/pandas/tests/util/test_assert_interval_array_equal.py b/pandas/tests/util/test_assert_interval_array_equal.py
index 8cc4ade3d7e95..4931aef26372a 100644
--- a/pandas/tests/util/test_assert_interval_array_equal.py
+++ b/pandas/tests/util/test_assert_interval_array_equal.py
@@ -9,7 +9,7 @@
     [
         {"start": 0, "periods": 4},
         {"start": 1, "periods": 5},
-        {"start": 5, "end": 10, "closed": "left"},
+        {"start": 5, "end": 10, "inclusive": "left"},
     ],
 )
 def test_interval_array_equal(kwargs):
@@ -19,8 +19,9 @@ def test_interval_array_equal(kwargs):
 
 def test_interval_array_equal_closed_mismatch():
     kwargs = {"start": 0, "periods": 5}
-    arr1 = interval_range(closed="left", **kwargs).values
-    arr2 = interval_range(closed="right", **kwargs).values
+    arr1 = interval_range(inclusive="left", **kwargs).values
+    arr1 = interval_range(inclusive="left", **kwargs).values
+    arr2 = interval_range(inclusive="right", **kwargs).values
 
     msg = """\
 IntervalArray are different

From 717cae3c4dfe19b0505095be762f8b1dbdbba0b7 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 00:22:47 +0800
Subject: [PATCH 04/26] pre commit

---
 pandas/tests/indexes/interval/test_astype.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/pandas/tests/indexes/interval/test_astype.py b/pandas/tests/indexes/interval/test_astype.py
index d9abc323d1442..7f5ef0cdd3bf4 100644
--- a/pandas/tests/indexes/interval/test_astype.py
+++ b/pandas/tests/indexes/interval/test_astype.py
@@ -161,7 +161,6 @@ def test_subtype_integer(self, subtype):
     @pytest.mark.parametrize("subtype", ["int64", "uint64"])
     def test_subtype_integer_with_non_integer_borders(self, subtype):
         index = interval_range(0.0, 3.0, freq=0.25)
-
         dtype = IntervalDtype(subtype, "right")
         result = index.astype(dtype)
         expected = IntervalIndex.from_arrays(

From f412c0274a16f672732223fb91410d389a3690f0 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 00:24:09 +0800
Subject: [PATCH 05/26] pre commit

---
 pandas/tests/util/test_assert_interval_array_equal.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/pandas/tests/util/test_assert_interval_array_equal.py b/pandas/tests/util/test_assert_interval_array_equal.py
index 4931aef26372a..243f357d7298c 100644
--- a/pandas/tests/util/test_assert_interval_array_equal.py
+++ b/pandas/tests/util/test_assert_interval_array_equal.py
@@ -20,7 +20,6 @@ def test_interval_array_equal(kwargs):
 def test_interval_array_equal_closed_mismatch():
     kwargs = {"start": 0, "periods": 5}
     arr1 = interval_range(inclusive="left", **kwargs).values
-    arr1 = interval_range(inclusive="left", **kwargs).values
     arr2 = interval_range(inclusive="right", **kwargs).values
 
     msg = """\

From 1457eec5c33e8833f6534ca4c982f8992d4067fd Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 00:42:28 +0800
Subject: [PATCH 06/26] doctest

---
 pandas/core/indexes/interval.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 1bc7578dadd46..902183f046c7a 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -443,7 +443,7 @@ def is_overlapping(self) -> bool:
 
         Intervals that share closed endpoints overlap:
 
-        >>> index = pd.interval_range(0, 3, closed='both')
+        >>> index = pd.interval_range(0, 3, inclusive='both')
         >>> index
         IntervalIndex([[0, 1], [1, 2], [2, 3]],
               dtype='interval[int64, both]')
@@ -452,7 +452,7 @@ def is_overlapping(self) -> bool:
 
         Intervals that only have an open endpoint in common do not overlap:
 
-        >>> index = pd.interval_range(0, 3, closed='left')
+        >>> index = pd.interval_range(0, 3, inclusive='left')
         >>> index
         IntervalIndex([[0, 1), [1, 2), [2, 3)],
               dtype='interval[int64, left]')

From b6bc36130aa37bcd1e39a8f268d0d53951178c8d Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 14 Mar 2022 09:25:23 +0800
Subject: [PATCH 07/26] doc

---
 doc/source/user_guide/advanced.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index b8df21ab5a5b4..3062de7fcf172 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,9 +1087,9 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, closed="both")
+   pd.interval_range(start=0, end=4, inclusive="both")
 
-   pd.interval_range(start=0, end=4, closed="neither")
+   pd.interval_range(start=0, end=4, inclusive="neither")
 
 Specifying ``start``, ``end``, and ``periods`` will generate a range of evenly spaced
 intervals from ``start`` to ``end`` inclusively, with ``periods`` number of elements

From 0d903a405525bbd975cac967357ab9630465af94 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Sat, 19 Mar 2022 22:35:36 +0800
Subject: [PATCH 08/26] resolve conflict

---
 doc/source/whatsnew/v1.5.0.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/whatsnew/v1.5.0.rst b/doc/source/whatsnew/v1.5.0.rst
index 880e6969f97cc..b66b50876c26b 100644
--- a/doc/source/whatsnew/v1.5.0.rst
+++ b/doc/source/whatsnew/v1.5.0.rst
@@ -341,7 +341,7 @@ Other Deprecations
 - Deprecated the ``warn`` parameter in :func:`infer_freq` (:issue:`45947`)
 - Deprecated allowing non-keyword arguments in :meth:`ExtensionArray.argsort` (:issue:`46134`)
 - Deprecated treating all-bool ``object``-dtype columns as bool-like in :meth:`DataFrame.any` and :meth:`DataFrame.all` with ``bool_only=True``, explicitly cast to bool instead (:issue:`46188`)
-- Deprecated behavior of method :meth:`DataFrame.quantile`, attribute ``numeric_only`` will default False. Including datetime/timedelta columns in the result (:issue:`7308`)
+- Deprecated behavior of method :meth:`DataFrame.quantile`, attribute ``numeric_only`` will default False. Including datetime/timedelta columns in the result (:issue:`7308`).
 - Deprecated the ``closed`` argument in :meth:`interval_range` in favor of ``inclusive`` argument; In a future version passing ``closed`` will raise (:issue:`40245`)
 -
 

From 3a9fd9e84b8601b14fb28266457d35b8efb73520 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Sat, 19 Mar 2022 22:38:50 +0800
Subject: [PATCH 09/26] add deprecated

---
 pandas/core/indexes/interval.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 902183f046c7a..498032d0b1828 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -973,10 +973,18 @@ def interval_range(
         for numeric and 'D' for datetime-like.
     name : str, default None
         Name of the resulting IntervalIndex.
-    inclusive : {'left', 'right', 'both', 'neither'}, default 'right'
+    closed : {'left', 'right', 'both', 'neither'}, default 'right'
         Whether the intervals are closed on the left-side, right-side, both
         or neither.
 
+        .. deprecated:: 1.5.0
+           Argument `closed` has been deprecated to standardize boundary inputs.
+           Use `inclusive` instead, to set each bound as closed or open.
+    inclusive : {"both", "neither", "left", "right"}, default "both"
+        Include boundaries; Whether to set each bound as closed or open.
+
+        .. versionadded:: 1.5.0
+
     Returns
     -------
     IntervalIndex

From 25527f739a6c9c2bb05496ce8d7f122671b31558 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Sun, 20 Mar 2022 22:53:38 +0800
Subject: [PATCH 10/26] add message

---
 pandas/core/indexes/interval.py | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 498032d0b1828..ceb12379786fd 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -11,6 +11,7 @@
     Hashable,
     Literal,
 )
+import warnings
 
 import numpy as np
 
@@ -954,7 +955,8 @@ def interval_range(
     periods=None,
     freq=None,
     name: Hashable = None,
-    inclusive: IntervalClosedType = "right",
+    closed: lib.NoDefault = lib.no_default,
+    inclusive: str | None = None,
 ) -> IntervalIndex:
     """
     Return a fixed frequency IntervalIndex.
@@ -1050,6 +1052,27 @@ def interval_range(
     IntervalIndex([[1, 2], [2, 3], [3, 4], [4, 5]],
                   dtype='interval[int64, both]')
     """
+    if inclusive is not None and not isinstance(closed, lib.NoDefault):
+        raise ValueError(
+            "Deprecated argument `closed` cannot be passed "
+            "if argument `inclusive` is not None"
+        )
+    elif not isinstance(closed, lib.NoDefault):
+        warnings.warn(
+            "Argument `closed` is deprecated in favor of `inclusive`.",
+            FutureWarning,
+            stacklevel=2,
+        )
+        if closed is None:
+            inclusive = "both"
+        elif closed in ("both", "neither", "left", "right"):
+            inclusive = closed
+        else:
+            raise ValueError(
+                "Argument `closed` has to be either 'both', 'neither', 'left', 'right',"
+                "or 'both'"
+            )
+
     start = maybe_box_datetimelike(start)
     end = maybe_box_datetimelike(end)
     endpoint = start if start is not None else end

From 1c41aa01b54184975ee280bbb932f01a6b7e045c Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 21 Mar 2022 00:19:04 +0800
Subject: [PATCH 11/26] test

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

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index ceb12379786fd..8aaf796db31e4 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -956,7 +956,7 @@ def interval_range(
     freq=None,
     name: Hashable = None,
     closed: lib.NoDefault = lib.no_default,
-    inclusive: str | None = None,
+    inclusive: str = "both",
 ) -> IntervalIndex:
     """
     Return a fixed frequency IntervalIndex.

From 6a34ed14701552a13b4b561645fe5d95812e2b93 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Wed, 23 Mar 2022 00:31:35 +0800
Subject: [PATCH 12/26] Update interval.py

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

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 8aaf796db31e4..640c4d4f6b228 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -1064,7 +1064,7 @@ def interval_range(
             stacklevel=2,
         )
         if closed is None:
-            inclusive = "both"
+            inclusive = "right"
         elif closed in ("both", "neither", "left", "right"):
             inclusive = closed
         else:

From 9e3319de6639592e9a1d8635cf74a0622cad4957 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Wed, 23 Mar 2022 23:07:56 +0800
Subject: [PATCH 13/26] test

---
 pandas/core/indexes/interval.py                      | 2 +-
 pandas/tests/frame/methods/test_round.py             | 2 +-
 pandas/tests/groupby/aggregate/test_cython.py        | 2 +-
 pandas/tests/indexes/interval/test_astype.py         | 4 ++--
 pandas/tests/indexes/interval/test_interval_range.py | 6 ++++--
 pandas/tests/io/excel/test_writers.py                | 5 ++++-
 pandas/tests/series/indexing/test_setitem.py         | 4 ++--
 7 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 640c4d4f6b228..8aaf796db31e4 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -1064,7 +1064,7 @@ def interval_range(
             stacklevel=2,
         )
         if closed is None:
-            inclusive = "right"
+            inclusive = "both"
         elif closed in ("both", "neither", "left", "right"):
             inclusive = closed
         else:
diff --git a/pandas/tests/frame/methods/test_round.py b/pandas/tests/frame/methods/test_round.py
index dd9206940bcd6..77cadfff55e2f 100644
--- a/pandas/tests/frame/methods/test_round.py
+++ b/pandas/tests/frame/methods/test_round.py
@@ -210,7 +210,7 @@ def test_round_nonunique_categorical(self):
 
     def test_round_interval_category_columns(self):
         # GH#30063
-        columns = pd.CategoricalIndex(pd.interval_range(0, 2))
+        columns = pd.CategoricalIndex(pd.interval_range(0, 2, inclusive="right"))
         df = DataFrame([[0.66, 1.1], [0.3, 0.25]], columns=columns)
 
         result = df.round()
diff --git a/pandas/tests/groupby/aggregate/test_cython.py b/pandas/tests/groupby/aggregate/test_cython.py
index 96009be5d12e3..9631de7833cf4 100644
--- a/pandas/tests/groupby/aggregate/test_cython.py
+++ b/pandas/tests/groupby/aggregate/test_cython.py
@@ -214,7 +214,7 @@ def test_cython_agg_empty_buckets_nanops(observed):
     result = df.groupby(pd.cut(df["a"], grps), observed=observed)._cython_agg_general(
         "add", alt=None, numeric_only=True
     )
-    intervals = pd.interval_range(0, 20, freq=5)
+    intervals = pd.interval_range(0, 20, freq=5, inclusive="right")
     expected = DataFrame(
         {"a": [0, 0, 36, 0]},
         index=pd.CategoricalIndex(intervals, name="a", ordered=True),
diff --git a/pandas/tests/indexes/interval/test_astype.py b/pandas/tests/indexes/interval/test_astype.py
index 7f5ef0cdd3bf4..4cdbe2bbcf12b 100644
--- a/pandas/tests/indexes/interval/test_astype.py
+++ b/pandas/tests/indexes/interval/test_astype.py
@@ -117,7 +117,7 @@ def test_subtype_integer(self, subtype_start, subtype_end):
     @pytest.mark.xfail(reason="GH#15832")
     def test_subtype_integer_errors(self):
         # int64 -> uint64 fails with negative values
-        index = interval_range(-10, 10)
+        index = interval_range(-10, 10, inclusive="right")
         dtype = IntervalDtype("uint64", "right")
 
         # Until we decide what the exception message _should_ be, we
@@ -170,7 +170,7 @@ def test_subtype_integer_with_non_integer_borders(self, subtype):
 
     def test_subtype_integer_errors(self):
         # float64 -> uint64 fails with negative values
-        index = interval_range(-10.0, 10.0)
+        index = interval_range(-10.0, 10.0, inclusive="right")
         dtype = IntervalDtype("uint64", "right")
         msg = re.escape(
             "Cannot convert interval[float64, right] to interval[uint64, right]; "
diff --git a/pandas/tests/indexes/interval/test_interval_range.py b/pandas/tests/indexes/interval/test_interval_range.py
index e0af6047dbae5..602fc35218520 100644
--- a/pandas/tests/indexes/interval/test_interval_range.py
+++ b/pandas/tests/indexes/interval/test_interval_range.py
@@ -163,7 +163,9 @@ def test_no_invalid_float_truncation(self, start, end, freq):
             breaks = [0.5, 2.0, 3.5, 5.0, 6.5]
         expected = IntervalIndex.from_breaks(breaks)
 
-        result = interval_range(start=start, end=end, periods=4, freq=freq)
+        result = interval_range(
+            start=start, end=end, periods=4, freq=freq, inclusive="right"
+        )
         tm.assert_index_equal(result, expected)
 
     @pytest.mark.parametrize(
@@ -184,7 +186,7 @@ def test_no_invalid_float_truncation(self, start, end, freq):
     def test_linspace_dst_transition(self, start, mid, end):
         # GH 20976: linspace behavior defined from start/end/periods
         # accounts for the hour gained/lost during DST transition
-        result = interval_range(start=start, end=end, periods=2)
+        result = interval_range(start=start, end=end, periods=2, inclusive="right")
         expected = IntervalIndex.from_breaks([start, mid, end])
         tm.assert_index_equal(result, expected)
 
diff --git a/pandas/tests/io/excel/test_writers.py b/pandas/tests/io/excel/test_writers.py
index 06c106ed22329..20ed24b00d2e3 100644
--- a/pandas/tests/io/excel/test_writers.py
+++ b/pandas/tests/io/excel/test_writers.py
@@ -282,7 +282,10 @@ def test_multiindex_interval_datetimes(self, ext):
             [
                 range(4),
                 pd.interval_range(
-                    start=pd.Timestamp("2020-01-01"), periods=4, freq="6M"
+                    start=pd.Timestamp("2020-01-01"),
+                    periods=4,
+                    freq="6M",
+                    inclusive="right",
                 ),
             ]
         )
diff --git a/pandas/tests/series/indexing/test_setitem.py b/pandas/tests/series/indexing/test_setitem.py
index 992f67c2affc6..1e84a05e2ae97 100644
--- a/pandas/tests/series/indexing/test_setitem.py
+++ b/pandas/tests/series/indexing/test_setitem.py
@@ -779,7 +779,7 @@ def test_index_putmask(self, obj, key, expected, val):
         pytest.param(
             # GH#45568 setting a valid NA value into IntervalDtype[int] should
             #  cast to IntervalDtype[float]
-            Series(interval_range(1, 5)),
+            Series(interval_range(1, 5, inclusive="right")),
             Series(
                 [Interval(1, 2), np.nan, Interval(3, 4), Interval(4, 5)],
                 dtype="interval[float64]",
@@ -1356,7 +1356,7 @@ class TestPeriodIntervalCoercion(CoercionTest):
     @pytest.fixture(
         params=[
             period_range("2016-01-01", periods=3, freq="D"),
-            interval_range(1, 5),
+            interval_range(1, 5, inclusive="right"),
         ]
     )
     def obj(self, request):

From 888fb73c15e53a5bbdb658edc38205b358ac7523 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Wed, 23 Mar 2022 23:23:32 +0800
Subject: [PATCH 14/26] Update advanced.rst

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index 3062de7fcf172..d2ac93975518f 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,7 +1087,7 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, inclusive="both")
+   pd.interval_range(start=0, end=4, inclusive="bot")
 
    pd.interval_range(start=0, end=4, inclusive="neither")
 

From c9444af336f9fedc98cb9dfd34783af9220fb204 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Wed, 23 Mar 2022 23:23:53 +0800
Subject: [PATCH 15/26] Update advanced.rst

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index d2ac93975518f..3062de7fcf172 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,7 +1087,7 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, inclusive="bot")
+   pd.interval_range(start=0, end=4, inclusive="both")
 
    pd.interval_range(start=0, end=4, inclusive="neither")
 

From 564345c0a6baf3a9e4cb9008186ed51913d2ea25 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Thu, 24 Mar 2022 01:09:51 +0800
Subject: [PATCH 16/26] Update advanced.rst

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index 3062de7fcf172..d2ac93975518f 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,7 +1087,7 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, inclusive="both")
+   pd.interval_range(start=0, end=4, inclusive="bot")
 
    pd.interval_range(start=0, end=4, inclusive="neither")
 

From 28c07ab39d1b29e92c9dc401f0c7622665cf0449 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Thu, 24 Mar 2022 01:10:06 +0800
Subject: [PATCH 17/26] Update advanced.rst

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index d2ac93975518f..3062de7fcf172 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,7 +1087,7 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, inclusive="bot")
+   pd.interval_range(start=0, end=4, inclusive="both")
 
    pd.interval_range(start=0, end=4, inclusive="neither")
 

From fbcd8c9ac1dba6abd5be7ad5492d7898bf0e0ab7 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Thu, 24 Mar 2022 08:51:32 +0800
Subject: [PATCH 18/26] Update advanced.rst

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index 3062de7fcf172..562590b92565a 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,7 +1087,7 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, inclusive="both")
+   pd.interval_range(start=0, end=4, inclusive="both ")
 
    pd.interval_range(start=0, end=4, inclusive="neither")
 

From be489ffcc617b8e17b65883ef2dac5c752e5c2b2 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Thu, 24 Mar 2022 08:51:49 +0800
Subject: [PATCH 19/26] Update advanced.rst

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index 562590b92565a..3062de7fcf172 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1087,7 +1087,7 @@ are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python
 
-   pd.interval_range(start=0, end=4, inclusive="both ")
+   pd.interval_range(start=0, end=4, inclusive="both")
 
    pd.interval_range(start=0, end=4, inclusive="neither")
 

From 7a976824a1d5540ec4a387260f516253fdf1fac5 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Thu, 24 Mar 2022 10:06:58 +0800
Subject: [PATCH 20/26] pre commit

---
 pandas/core/indexes/interval.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 8aaf796db31e4..27dfd7c33a9c0 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -161,7 +161,7 @@ def _new_IntervalIndex(cls, d):
     A new ``IntervalIndex`` is typically constructed using
     :func:`interval_range`:
 
-    >>> pd.interval_range(start=0, end=5)
+    >>> pd.interval_range(start=0, end=5, inclusive="right")
     IntervalIndex([(0, 1], (1, 2], (2, 3], (3, 4], (4, 5]],
                   dtype='interval[int64, right]')
 
@@ -1009,14 +1009,14 @@ def interval_range(
     --------
     Numeric ``start`` and  ``end`` is supported.
 
-    >>> pd.interval_range(start=0, end=5)
+    >>> pd.interval_range(start=0, end=5, inclusive="right")
     IntervalIndex([(0, 1], (1, 2], (2, 3], (3, 4], (4, 5]],
                   dtype='interval[int64, right]')
 
     Additionally, datetime-like input is also supported.
 
     >>> pd.interval_range(start=pd.Timestamp('2017-01-01'),
-    ...                   end=pd.Timestamp('2017-01-04'))
+    ...                   end=pd.Timestamp('2017-01-04'), inclusive="right")
     IntervalIndex([(2017-01-01, 2017-01-02], (2017-01-02, 2017-01-03],
                    (2017-01-03, 2017-01-04]],
                   dtype='interval[datetime64[ns], right]')
@@ -1025,7 +1025,7 @@ def interval_range(
     endpoints of the individual intervals within the ``IntervalIndex``.  For
     numeric ``start`` and ``end``, the frequency must also be numeric.
 
-    >>> pd.interval_range(start=0, periods=4, freq=1.5)
+    >>> pd.interval_range(start=0, periods=4, freq=1.5, inclusive="right")
     IntervalIndex([(0.0, 1.5], (1.5, 3.0], (3.0, 4.5], (4.5, 6.0]],
                   dtype='interval[float64, right]')
 
@@ -1033,7 +1033,7 @@ def interval_range(
     convertible to a DateOffset.
 
     >>> pd.interval_range(start=pd.Timestamp('2017-01-01'),
-    ...                   periods=3, freq='MS')
+    ...                   periods=3, freq='MS', inclusive="right")
     IntervalIndex([(2017-01-01, 2017-02-01], (2017-02-01, 2017-03-01],
                    (2017-03-01, 2017-04-01]],
                   dtype='interval[datetime64[ns], right]')
@@ -1041,7 +1041,7 @@ def interval_range(
     Specify ``start``, ``end``, and ``periods``; the frequency is generated
     automatically (linearly spaced).
 
-    >>> pd.interval_range(start=0, end=6, periods=4)
+    >>> pd.interval_range(start=0, end=6, periods=4, inclusive="right")
     IntervalIndex([(0.0, 1.5], (1.5, 3.0], (3.0, 4.5], (4.5, 6.0]],
               dtype='interval[float64, right]')
 

From d7dade54faaf040448c4d9fc4a605f53be163d05 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Sun, 27 Mar 2022 13:56:14 +0800
Subject: [PATCH 21/26] closed

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index 3062de7fcf172..6431a756e335c 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1082,7 +1082,7 @@ of :ref:`frequency aliases <timeseries.offset_aliases>` with datetime-like inter
 
    pd.interval_range(start=pd.Timedelta("0 days"), periods=3, freq="9H")
 
-Additionally, the ``closed`` parameter can be used to specify which side(s) the intervals
+Additionally, the ``inclusive`` parameter can be used to specify which side(s) the intervals
 are closed on.  Intervals are closed on the right side by default.
 
 .. ipython:: python

From de0a29293cfc785576add571d54604ec6e582a45 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Sun, 27 Mar 2022 13:59:45 +0800
Subject: [PATCH 22/26] doc

---
 doc/source/user_guide/advanced.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/user_guide/advanced.rst b/doc/source/user_guide/advanced.rst
index 6431a756e335c..3081c6f7c6a08 100644
--- a/doc/source/user_guide/advanced.rst
+++ b/doc/source/user_guide/advanced.rst
@@ -1083,7 +1083,7 @@ of :ref:`frequency aliases <timeseries.offset_aliases>` with datetime-like inter
    pd.interval_range(start=pd.Timedelta("0 days"), periods=3, freq="9H")
 
 Additionally, the ``inclusive`` parameter can be used to specify which side(s) the intervals
-are closed on.  Intervals are closed on the right side by default.
+are closed on.  Intervals are closed on the both side by default.
 
 .. ipython:: python
 

From 5154c093741acf8d36981ad30c1820c9edfb0ee0 Mon Sep 17 00:00:00 2001
From: Khor Chean Wei <cheanwei.KCW@gmail.com>
Date: Mon, 28 Mar 2022 00:07:35 +0800
Subject: [PATCH 23/26] Update interval.py

---
 pandas/core/indexes/interval.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 27dfd7c33a9c0..70bafaaac2b23 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -1069,8 +1069,8 @@ def interval_range(
             inclusive = closed
         else:
             raise ValueError(
-                "Argument `closed` has to be either 'both', 'neither', 'left', 'right',"
-                "or 'both'"
+                "Argument `closed` has to be either" 
+                "'both', 'neither', 'left' or 'right'"
             )
 
     start = maybe_box_datetimelike(start)

From ede24b67cb4cc8fa75cbd24b77041b6ec6c11016 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Mon, 28 Mar 2022 00:45:05 +0800
Subject: [PATCH 24/26] pre commit

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

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 70bafaaac2b23..3d864658965d0 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -1069,7 +1069,7 @@ def interval_range(
             inclusive = closed
         else:
             raise ValueError(
-                "Argument `closed` has to be either" 
+                "Argument `closed` has to be either"
                 "'both', 'neither', 'left' or 'right'"
             )
 

From dd16a4629c5362b07fe1641a2228910b6e3afcd1 Mon Sep 17 00:00:00 2001
From: "chean.wei.khor" <cheanwei.KCW@gmail.com>
Date: Tue, 29 Mar 2022 23:11:26 +0800
Subject: [PATCH 25/26] doc

---
 pandas/core/indexes/interval.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
index 3d864658965d0..9aabe4e9c9e1c 100644
--- a/pandas/core/indexes/interval.py
+++ b/pandas/core/indexes/interval.py
@@ -956,7 +956,7 @@ def interval_range(
     freq=None,
     name: Hashable = None,
     closed: lib.NoDefault = lib.no_default,
-    inclusive: str = "both",
+    inclusive: IntervalClosedType | None = None,
 ) -> IntervalIndex:
     """
     Return a fixed frequency IntervalIndex.
@@ -1072,6 +1072,8 @@ def interval_range(
                 "Argument `closed` has to be either"
                 "'both', 'neither', 'left' or 'right'"
             )
+    elif inclusive is None:
+        inclusive = "both"
 
     start = maybe_box_datetimelike(start)
     end = maybe_box_datetimelike(end)

From dc4658cfa557a6d3b1389fec7020f0779cc208c9 Mon Sep 17 00:00:00 2001
From: weikhor <cheanwei.KCW@gmail.com>
Date: Sun, 3 Apr 2022 15:22:11 +0800
Subject: [PATCH 26/26] test

---
 .../tests/indexes/interval/test_interval_range.py  | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pandas/tests/indexes/interval/test_interval_range.py b/pandas/tests/indexes/interval/test_interval_range.py
index 602fc35218520..63e7f3aa2b120 100644
--- a/pandas/tests/indexes/interval/test_interval_range.py
+++ b/pandas/tests/indexes/interval/test_interval_range.py
@@ -355,3 +355,17 @@ def test_errors(self):
         msg = "Start and end cannot both be tz-aware with different timezones"
         with pytest.raises(TypeError, match=msg):
             interval_range(start=start, end=end)
+
+    def test_interval_range_error_and_warning(self):
+        # GH 40245
+
+        msg = (
+            "Deprecated argument `closed` cannot "
+            "be passed if argument `inclusive` is not None"
+        )
+        with pytest.raises(ValueError, match=msg):
+            interval_range(end=5, periods=4, closed="both", inclusive="both")
+
+        msg = "Argument `closed` is deprecated in favor of `inclusive`"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            interval_range(end=5, periods=4, closed="right")