pandas-dev · jreback · Aug 31, 2020 · Aug 28, 2020 · Aug 28, 2020 · Aug 28, 2020
diff --git a/doc/source/whatsnew/v1.1.2.rst b/doc/source/whatsnew/v1.1.2.rst
@@ -16,6 +16,7 @@ Fixed regressions
 ~~~~~~~~~~~~~~~~~
 - Regression in :meth:`DatetimeIndex.intersection` incorrectly raising ``AssertionError`` when intersecting against a list (:issue:`35876`)
 - Performance regression for :meth:`RangeIndex.format` (:issue:`35712`)
+- Regression in :meth:`DataFrame.replace` where a ``TypeError`` would be raised when attempting to replace elements of type :class:`Interval` (:issue:`35931`)
 -
 
 

diff --git a/pandas/_libs/interval.pyx b/pandas/_libs/interval.pyx
@@ -299,7 +299,6 @@ cdef class Interval(IntervalMixin):
     True
     """
     _typ = "interval"
-    __array_priority__ = 1000
 
     cdef readonly object left
     """

diff --git a/pandas/tests/frame/methods/test_replace.py b/pandas/tests/frame/methods/test_replace.py
@@ -1581,3 +1581,10 @@ def test_replace_with_compiled_regex(self):
         result = df.replace({regex: "z"}, regex=True)
         expected = pd.DataFrame(["z", "b", "c"])
         tm.assert_frame_equal(result, expected)
+
+    def test_replace_intervals(self):
+        # https://github.com/pandas-dev/pandas/issues/35931
+        df = pd.DataFrame({"a": [pd.Interval(0, 1), pd.Interval(0, 1)]})
+        result = df.replace({"a": {pd.Interval(0, 1): "x"}})
+        expected = pd.DataFrame({"a": ["x", "x"]})
+        tm.assert_frame_equal(result, expected)
-Original file line number
+Diff line change
@@ Expand Up / @@ -299,7 +299,6 @@ cdef class Interval(IntervalMixin): @@
         True
         """
         _typ = "interval"
-        __array_priority__ = 1000
         cdef readonly object left
         """
@@ Expand Down @@