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Issue #14521: Make result of float('nan') and float('-nan') more consistent across platforms. Further, don't rely on Py_HUGE_VAL for float('inf').

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Mark Dickinson 2012-04-29 15:31:56 +01:00
parent d68ac85e9a
commit e383e82e04
5 changed files with 102 additions and 5 deletions
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13
Lib/test/test_float.py
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@ -870,6 +870,19 @@ class InfNanTest(unittest.TestCase):
self.assertFalse(NAN.is_inf())
self.assertFalse((0.).is_inf())
def test_inf_signs(self):
self.assertEqual(copysign(1.0, float('inf')), 1.0)
self.assertEqual(copysign(1.0, float('-inf')), -1.0)
@unittest.skipUnless(getattr(sys, 'float_repr_style', '') == 'short',
"applies only when using short float repr style")
def test_nan_signs(self):
# When using the dtoa.c code, the sign of float('nan') should
# be predictable.
self.assertEqual(copysign(1.0, float('nan')), 1.0)
self.assertEqual(copysign(1.0, float('-nan')), -1.0)
fromHex = float.fromhex
toHex = float.hex
class HexFloatTestCase(unittest.TestCase):