From e470b850ca5b52b5a196bb7a0dea4819b29eba04 Mon Sep 17 00:00:00 2001
From: phofl <patrick_hoefler@gmx.net>
Date: Sat, 16 Jan 2021 03:16:05 +0100
Subject: [PATCH 1/2] BUG: assert_frame_equal raising TypeError with check_like
 and mixed dtype in Index or columns

---
 pandas/_testing/asserters.py                 | 6 +++---
 pandas/tests/util/test_assert_frame_equal.py | 6 ++++++
 pandas/tests/util/test_assert_index_equal.py | 6 ++++++
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/pandas/_testing/asserters.py b/pandas/_testing/asserters.py
index 69e17199c9a90..b20cc0897ec18 100644
--- a/pandas/_testing/asserters.py
+++ b/pandas/_testing/asserters.py
@@ -29,7 +29,7 @@
     Series,
     TimedeltaIndex,
 )
-from pandas.core.algorithms import take_1d
+from pandas.core.algorithms import safe_sort, take_1d
 from pandas.core.arrays import (
     DatetimeArray,
     ExtensionArray,
@@ -344,8 +344,8 @@ def _get_ilevel_values(index, level):
 
     # If order doesn't matter then sort the index entries
     if not check_order:
-        left = left.sort_values()
-        right = right.sort_values()
+        left = Index(safe_sort(left))
+        right = Index(safe_sort(right))
 
     # MultiIndex special comparison for little-friendly error messages
     if left.nlevels > 1:
diff --git a/pandas/tests/util/test_assert_frame_equal.py b/pandas/tests/util/test_assert_frame_equal.py
index bb721afda2b8b..a594751808532 100644
--- a/pandas/tests/util/test_assert_frame_equal.py
+++ b/pandas/tests/util/test_assert_frame_equal.py
@@ -299,3 +299,9 @@ def test_allows_duplicate_labels():
 
     with pytest.raises(AssertionError, match="<Flags"):
         tm.assert_frame_equal(left, right)
+
+
+def test_assert_frame_equal_columns_mixed_dtype():
+    # GH#39168
+    df = DataFrame([[0, 1, 2]], columns=["foo", "bar", 42], index=[1, "test", 2])
+    tm.assert_frame_equal(df, df, check_like=True)
diff --git a/pandas/tests/util/test_assert_index_equal.py b/pandas/tests/util/test_assert_index_equal.py
index 988a0e7b24379..42c6db3d0b684 100644
--- a/pandas/tests/util/test_assert_index_equal.py
+++ b/pandas/tests/util/test_assert_index_equal.py
@@ -192,3 +192,9 @@ def test_index_equal_category_mismatch(check_categorical):
             tm.assert_index_equal(idx1, idx2, check_categorical=check_categorical)
     else:
         tm.assert_index_equal(idx1, idx2, check_categorical=check_categorical)
+
+
+def test_assert_index_equal_mixed_dtype():
+    # GH#39168
+    idx = Index(["foo", "bar", 42])
+    tm.assert_index_equal(idx, idx, check_order=False)

From 20f22b567c66aeb42355323c2c62147f3bea3dd1 Mon Sep 17 00:00:00 2001
From: phofl <patrick_hoefler@gmx.net>
Date: Sat, 16 Jan 2021 03:15:18 +0100
Subject: [PATCH 2/2] BUG: assert_frame_equal raising TypeError with check_like
 and mixed dtype in Index or columns

---
 doc/source/whatsnew/v1.2.1.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/source/whatsnew/v1.2.1.rst b/doc/source/whatsnew/v1.2.1.rst
index 55fddb8b732e2..d9c2980d43473 100644
--- a/doc/source/whatsnew/v1.2.1.rst
+++ b/doc/source/whatsnew/v1.2.1.rst
@@ -30,7 +30,8 @@ Fixed regressions
 - Fixed regression that raised ``AttributeError`` with PyArrow versions [0.16.0, 1.0.0) (:issue:`38801`)
 - Fixed regression in :meth:`DataFrame.groupby` when aggregating an :class:`ExtensionDType` that could fail for non-numeric values (:issue:`38980`)
 - Fixed regression in :meth:`DataFrame.loc.__setitem__` raising ``KeyError`` with :class:`MultiIndex` and list-like columns indexer enlarging :class:`DataFrame` (:issue:`39147`)
--
+- Fixed regression in :func:`pandas.testing.assert_frame_equal` raising ``TypeError`` with ``check_like=True`` when :class:`Index` or columns have mixed dtype (:issue:`39168`)
+
 
 .. ---------------------------------------------------------------------------
 
@@ -41,7 +42,7 @@ Bug fixes
 
 - Bug in :meth:`read_csv` with ``float_precision="high"`` caused segfault or wrong parsing of long exponent strings. This resulted in a regression in some cases as the default for ``float_precision`` was changed in pandas 1.2.0 (:issue:`38753`)
 - Bug in :func:`read_csv` not closing an opened file handle when a ``csv.Error`` or ``UnicodeDecodeError`` occurred while initializing (:issue:`39024`)
--
+- Bug in :func:`pandas.testing.assert_index_equal` raising ``TypeError`` with ``check_order=False`` when :class:`Index` has mixed dtype (:issue:`39168`)
 
 .. ---------------------------------------------------------------------------