From 99fdbb97b8d03231b36b6f09a289743cdecfea08 Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Date: Tue, 11 Apr 2023 18:30:48 +0200
Subject: [PATCH] Backport PR #52572: REGR: MultiIndex.isin raising TypeError
 for generator

---
 doc/source/whatsnew/v2.0.1.rst          | 1 +
 pandas/core/indexes/multi.py            | 4 ++++
 pandas/tests/indexes/multi/test_isin.py | 8 ++++++++
 3 files changed, 13 insertions(+)

diff --git a/doc/source/whatsnew/v2.0.1.rst b/doc/source/whatsnew/v2.0.1.rst
index a4a58811e382f..cfe7c587f039f 100644
--- a/doc/source/whatsnew/v2.0.1.rst
+++ b/doc/source/whatsnew/v2.0.1.rst
@@ -16,6 +16,7 @@ Fixed regressions
 - Fixed regression for subclassed Series when constructing from a dictionary (:issue:`52445`)
 - Fixed regression in :meth:`Series.describe` showing ``RuntimeWarning`` for extension dtype :class:`Series` with one element (:issue:`52515`)
 - Fixed regression in :meth:`DataFrame.sort_values` not resetting index when :class:`DataFrame` is already sorted and ``ignore_index=True`` (:issue:`52553`)
+- Fixed regression in :meth:`MultiIndex.isin` raising ``TypeError`` for ``Generator`` (:issue:`52568`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_201.bug_fixes:
diff --git a/pandas/core/indexes/multi.py b/pandas/core/indexes/multi.py
index 1bdc5c5e3da69..2054cdae989af 100644
--- a/pandas/core/indexes/multi.py
+++ b/pandas/core/indexes/multi.py
@@ -7,6 +7,7 @@
     Any,
     Callable,
     Collection,
+    Generator,
     Hashable,
     Iterable,
     List,
@@ -3749,6 +3750,9 @@ def delete(self, loc) -> MultiIndex:
 
     @doc(Index.isin)
     def isin(self, values, level=None) -> npt.NDArray[np.bool_]:
+        if isinstance(values, Generator):
+            values = list(values)
+
         if level is None:
             if len(values) == 0:
                 return np.zeros((len(self),), dtype=np.bool_)
diff --git a/pandas/tests/indexes/multi/test_isin.py b/pandas/tests/indexes/multi/test_isin.py
index 2723e7e4db8eb..68fdf25359f1b 100644
--- a/pandas/tests/indexes/multi/test_isin.py
+++ b/pandas/tests/indexes/multi/test_isin.py
@@ -93,3 +93,11 @@ def test_isin_empty():
     result = midx.isin([])
     expected = np.array([False, False])
     tm.assert_numpy_array_equal(result, expected)
+
+
+def test_isin_generator():
+    # GH#52568
+    midx = MultiIndex.from_tuples([(1, 2)])
+    result = midx.isin(x for x in [(1, 2)])
+    expected = np.array([True])
+    tm.assert_numpy_array_equal(result, expected)