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Issue #15544: Fix Decimal.__float__ to work with payload-carrying NaNs.

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This commit is contained in:
Mark Dickinson 2012-08-24 18:53:10 +01:00
parent cb0ec7dc42
commit fc33d4ce0a
4 changed files with 42 additions and 2 deletions
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16
Lib/test/test_decimal.py
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@ -1942,6 +1942,22 @@ class UsabilityTest(unittest.TestCase):
for d, n, r in test_triples:
self.assertEqual(str(round(Decimal(d), n)), r)
def test_nan_to_float(self):
# Test conversions of decimal NANs to float.
# See http://bugs.python.org/issue15544
Decimal = self.decimal.Decimal
for s in ('nan', 'nan1234', '-nan', '-nan2468'):
f = float(Decimal(s))
self.assertTrue(math.isnan(f))
sign = math.copysign(1.0, f)
self.assertEqual(sign, -1.0 if s.startswith('-') else 1.0)
def test_snan_to_float(self):
Decimal = self.decimal.Decimal
for s in ('snan', '-snan', 'snan1357', '-snan1234'):
d = Decimal(s)
self.assertRaises(ValueError, float, d)
def test_eval_round_trip(self):
Decimal = self.decimal.Decimal