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Issue #7279: Make comparisons involving a Decimal sNaN signal InvalidOperation.

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This commit is contained in:
Mark Dickinson 2010-04-02 10:17:07 +00:00
parent ea2d389474
commit e096e82e82
3 changed files with 60 additions and 14 deletions
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15
Lib/decimal.py
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@ -845,8 +845,11 @@ def _cmp(self, other):
# subject of what should happen for a comparison involving a NaN.
# We take the following approach:
#
# == comparisons involving a NaN always return False
# != comparisons involving a NaN always return True
# == comparisons involving a quiet NaN always return False
# != comparisons involving a quiet NaN always return True
# == or != comparisons involving a signaling NaN signal
# InvalidOperation, and return False or True as above if the
# InvalidOperation is not trapped.
# <, >, <= and >= comparisons involving a (quiet or signaling)
# NaN signal InvalidOperation, and return False if the
# InvalidOperation is not trapped.
@ -854,19 +857,19 @@ def _cmp(self, other):
# This behavior is designed to conform as closely as possible to
# that specified by IEEE 754.
def __eq__(self, other):
def __eq__(self, other, context=None):
other = _convert_other(other, allow_float=True)
if other is NotImplemented:
return other
if self.is_nan() or other.is_nan():
if self._check_nans(other, context):
return False
return self._cmp(other) == 0
def __ne__(self, other):
def __ne__(self, other, context=None):
other = _convert_other(other, allow_float=True)
if other is NotImplemented:
return other
if self.is_nan() or other.is_nan():
if self._check_nans(other, context):
return True
return self._cmp(other) != 0