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Issue #15882: Change _decimal to accept any coefficient tuple when

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constructing infinities. This is done for backwards compatibility
with decimal.py: Infinity coefficients are undefined in _decimal
(in accordance with the specification).
This commit is contained in:
Stefan Krah 2012-09-10 19:34:58 +02:00
parent f47d79fec1
commit 76e12179c5
3 changed files with 21 additions and 7 deletions
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17
Lib/test/test_decimal.py
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@ -1992,7 +1992,8 @@ class UsabilityTest(unittest.TestCase):
d = Decimal("-4.34913534E-17")
self.assertEqual(d.as_tuple(), (1, (4, 3, 4, 9, 1, 3, 5, 3, 4), -25) )
# XXX non-compliant infinity payload.
# The '0' coefficient is implementation specific to decimal.py.
# It has no meaning in the C-version and is ignored there.
d = Decimal("Infinity")
self.assertEqual(d.as_tuple(), (0, (0,), 'F') )
@ -2012,12 +2013,14 @@ class UsabilityTest(unittest.TestCase):
d = Decimal( (1, (), 'n') )
self.assertEqual(d.as_tuple(), (1, (), 'n') )
# XXX coefficient in infinity should raise an error
if self.decimal == P:
d = Decimal( (0, (4, 5, 3, 4), 'F') )
self.assertEqual(d.as_tuple(), (0, (0,), 'F'))
d = Decimal( (1, (0, 2, 7, 1), 'F') )
self.assertEqual(d.as_tuple(), (1, (0,), 'F'))
# For infinities, decimal.py has always silently accepted any
# coefficient tuple.
d = Decimal( (0, (0,), 'F') )
self.assertEqual(d.as_tuple(), (0, (0,), 'F'))
d = Decimal( (0, (4, 5, 3, 4), 'F') )
self.assertEqual(d.as_tuple(), (0, (0,), 'F'))
d = Decimal( (1, (0, 2, 7, 1), 'F') )
self.assertEqual(d.as_tuple(), (1, (0,), 'F'))
def test_subclassing(self):
# Different behaviours when subclassing Decimal