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bpo-29602: fix signed zero handling in complex constructor. (#203)

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* Fix incorrect handling of signed zeros for complex-related classes.

* Add Misc/NEWS entry.
This commit is contained in:
Mark Dickinson 2017-02-20 20:28:15 +00:00 • committed by GitHub
parent 1b8df107f8
commit 112ec38c15
3 changed files with 30 additions and 3 deletions
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23
Lib/test/test_complex.py
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@ -387,6 +387,29 @@ class ComplexTest(unittest.TestCase):
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: