bpo-39871: Fix possible SystemError in atan2, copysign and remainder (GH-18806)
In math_2(), the first PyFloat_AsDouble() call should be checked
for failure before the second call.
Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
index cc39402..4b848a5 100644
--- a/Lib/test/test_math.py
+++ b/Lib/test/test_math.py
@@ -1992,6 +1992,22 @@
with self.subTest(x=x):
self.assertEqual(math.ulp(-x), math.ulp(x))
+ def test_issue39871(self):
+ # A SystemError should not be raised if the first arg to atan2(),
+ # copysign(), or remainder() cannot be converted to a float.
+ class F:
+ def __float__(self):
+ self.converted = True
+ 1/0
+ for func in math.atan2, math.copysign, math.remainder:
+ y = F()
+ with self.assertRaises(TypeError):
+ func("not a number", y)
+
+ # There should not have been any attempt to convert the second
+ # argument to a float.
+ self.assertFalse(getattr(y, "converted", False))
+
# Custom assertions.
def assertIsNaN(self, value):