bpo-29602: fix signed zero handling in complex constructor. (#203) (#206)
* Fix incorrect handling of signed zeros for complex-related classes.
* Add Misc/NEWS entry.
(cherry picked from commit 112ec38c15b388fe025ccb85369a584d218b1160)
diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py
index c249ca7..cee4934 100644
--- a/Lib/test/test_complex.py
+++ b/Lib/test/test_complex.py
@@ -387,6 +387,29 @@
self.assertAlmostEqual(complex(complex1(1j)), 2j)
self.assertRaises(TypeError, complex, complex2(1j))
+ @support.requires_IEEE_754
+ def test_constructor_special_numbers(self):
+ class complex2(complex):
+ pass
+ for x in 0.0, -0.0, INF, -INF, NAN:
+ for y in 0.0, -0.0, INF, -INF, NAN:
+ with self.subTest(x=x, y=y):
+ z = complex(x, y)
+ self.assertFloatsAreIdentical(z.real, x)
+ self.assertFloatsAreIdentical(z.imag, y)
+ z = complex2(x, y)
+ self.assertIs(type(z), complex2)
+ self.assertFloatsAreIdentical(z.real, x)
+ self.assertFloatsAreIdentical(z.imag, y)
+ z = complex(complex2(x, y))
+ self.assertIs(type(z), complex)
+ self.assertFloatsAreIdentical(z.real, x)
+ self.assertFloatsAreIdentical(z.imag, y)
+ z = complex2(complex(x, y))
+ self.assertIs(type(z), complex2)
+ self.assertFloatsAreIdentical(z.real, x)
+ self.assertFloatsAreIdentical(z.imag, y)
+
def test_underscores(self):
# check underscores
for lit in VALID_UNDERSCORE_LITERALS: