bpo-44558: Make the implementation consistency of operator.indexOf (GH-27012)
(cherry picked from commit 09302405d22e86884d6058226790c0cdf5b72f14)
Co-authored-by: Dong-hee Na <donghee.na@python.org>
diff --git a/Lib/operator.py b/Lib/operator.py
index fb58851..6782703 100644
--- a/Lib/operator.py
+++ b/Lib/operator.py
@@ -173,7 +173,7 @@ def getitem(a, b):
def indexOf(a, b):
"Return the first index of b in a."
for i, j in enumerate(a):
- if j == b:
+ if j is b or j == b:
return i
else:
raise ValueError('sequence.index(x): x not in sequence')
diff --git a/Lib/test/test_operator.py b/Lib/test/test_operator.py
index 1ecae85..d50306b 100644
--- a/Lib/test/test_operator.py
+++ b/Lib/test/test_operator.py
@@ -188,6 +188,9 @@ def test_indexOf(self):
self.assertRaises(ZeroDivisionError, operator.indexOf, BadIterable(), 1)
self.assertEqual(operator.indexOf([4, 3, 2, 1], 3), 1)
self.assertRaises(ValueError, operator.indexOf, [4, 3, 2, 1], 0)
+ nan = float("nan")
+ self.assertEqual(operator.indexOf([nan, nan, 21], nan), 0)
+ self.assertEqual(operator.indexOf([{}, 1, {}, 2], {}), 0)
def test_invert(self):
operator = self.module
diff --git a/Misc/NEWS.d/next/Library/2021-07-04-21-16-53.bpo-44558.cm7Slv.rst b/Misc/NEWS.d/next/Library/2021-07-04-21-16-53.bpo-44558.cm7Slv.rst
new file mode 100644
index 0000000..647a704
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-07-04-21-16-53.bpo-44558.cm7Slv.rst
@@ -0,0 +1,2 @@
+Make the implementation consistency of :func:`~operator.indexOf` between
+C and Python versions. Patch by Dong-hee Na.