From 4ef7fad45c474c126000bbfb22fe7815df764ce1 Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Date: Sat, 25 Nov 2023 00:46:45 +0100
Subject: [PATCH 1/3] BUG: reset_index not preserving object dtype for string
 option

---
 doc/source/whatsnew/v2.1.4.rst                  | 2 +-
 pandas/core/series.py                           | 2 +-
 pandas/tests/series/methods/test_reset_index.py | 6 ++++++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/doc/source/whatsnew/v2.1.4.rst b/doc/source/whatsnew/v2.1.4.rst
index 543a9864ced26..e57803fcfeea5 100644
--- a/doc/source/whatsnew/v2.1.4.rst
+++ b/doc/source/whatsnew/v2.1.4.rst
@@ -25,7 +25,7 @@ Bug fixes
 - Bug in :meth:`Index.__getitem__` returning wrong result for Arrow dtypes and negative stepsize (:issue:`55832`)
 - Fixed bug in :meth:`DataFrame.__setitem__` casting :class:`Index` with object-dtype to PyArrow backed strings when ``infer_string`` option is set (:issue:`55638`)
 - Fixed bug in :meth:`Index.insert` casting object-dtype to PyArrow backed strings when ``infer_string`` option is set (:issue:`55638`)
--
+- Fixed bug in :meth:`Series.reset_index` not preserving object dtype when ``infer_string`` is set (:issue:`56160`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_214.other:
diff --git a/pandas/core/series.py b/pandas/core/series.py
index a9679f22f9933..f3e05173d9c2a 100644
--- a/pandas/core/series.py
+++ b/pandas/core/series.py
@@ -1702,7 +1702,7 @@ def reset_index(
                 return new_ser.__finalize__(self, method="reset_index")
             else:
                 return self._constructor(
-                    self._values.copy(), index=new_index, copy=False
+                    self._values.copy(), index=new_index, copy=False, dtype=self.dtype
                 ).__finalize__(self, method="reset_index")
         elif inplace:
             raise TypeError(
diff --git a/pandas/tests/series/methods/test_reset_index.py b/pandas/tests/series/methods/test_reset_index.py
index 9e6b4ce0df1d6..56f15c0b0e52c 100644
--- a/pandas/tests/series/methods/test_reset_index.py
+++ b/pandas/tests/series/methods/test_reset_index.py
@@ -163,6 +163,12 @@ def test_reset_index_inplace_and_drop_ignore_name(self):
         expected = Series(range(2), name="old")
         tm.assert_series_equal(ser, expected)
 
+    def test_reset_index_drop_infer_string(self):
+        # GH#56160
+        ser = Series(["a", "b", "c"], dtype=object)
+        result = ser.reset_index(drop=True)
+        tm.assert_series_equal(result, ser)
+
 
 @pytest.mark.parametrize(
     "array, dtype",

From fb8552ca8090ecc7e24608adec25517db9b910ff Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Date: Sun, 26 Nov 2023 12:36:59 +0100
Subject: [PATCH 2/3] Fixup

---
 pandas/tests/series/methods/test_reset_index.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/series/methods/test_reset_index.py b/pandas/tests/series/methods/test_reset_index.py
index 56f15c0b0e52c..9980b4450ba52 100644
--- a/pandas/tests/series/methods/test_reset_index.py
+++ b/pandas/tests/series/methods/test_reset_index.py
@@ -11,6 +11,7 @@
     RangeIndex,
     Series,
     date_range,
+    option_context,
 )
 import pandas._testing as tm
 
@@ -165,8 +166,10 @@ def test_reset_index_inplace_and_drop_ignore_name(self):
 
     def test_reset_index_drop_infer_string(self):
         # GH#56160
+        pytest.importorskip("pyarrow")
         ser = Series(["a", "b", "c"], dtype=object)
-        result = ser.reset_index(drop=True)
+        with option_context("future.infer_string", True):
+            result = ser.reset_index(drop=True)
         tm.assert_series_equal(result, ser)
 
 

From 6914fcda3417b903eef7bd21259822d973cf1b46 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Thu, 7 Dec 2023 04:27:52 +0000
Subject: [PATCH 3/3] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 doc/source/whatsnew/v2.1.4.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/source/whatsnew/v2.1.4.rst b/doc/source/whatsnew/v2.1.4.rst
index 23246c02b7ac8..1c412701ae5e9 100644
--- a/doc/source/whatsnew/v2.1.4.rst
+++ b/doc/source/whatsnew/v2.1.4.rst
@@ -29,8 +29,8 @@ Bug fixes
 - Fixed bug in :meth:`DataFrame.__setitem__` casting :class:`Index` with object-dtype to PyArrow backed strings when ``infer_string`` option is set (:issue:`55638`)
 - Fixed bug in :meth:`DataFrame.to_hdf` raising when columns have ``StringDtype`` (:issue:`55088`)
 - Fixed bug in :meth:`Index.insert` casting object-dtype to PyArrow backed strings when ``infer_string`` option is set (:issue:`55638`)
-- Fixed bug in :meth:`Series.reset_index` not preserving object dtype when ``infer_string`` is set (:issue:`56160`)
 - Fixed bug in :meth:`Series.mode` not keeping object dtype when ``infer_string`` is set (:issue:`56183`)
+- Fixed bug in :meth:`Series.reset_index` not preserving object dtype when ``infer_string`` is set (:issue:`56160`)
 - Fixed bug in :meth:`Series.str.split` and :meth:`Series.str.rsplit` when ``pat=None`` for :class:`ArrowDtype` with ``pyarrow.string`` (:issue:`56271`)
 - Fixed bug in :meth:`Series.str.translate` losing object dtype when string option is set (:issue:`56152`)