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  r79583 | mark.dickinson | 2010-04-02 09:53:22 +0100 (Fri, 02 Apr 2010) | 7 lines

  Issue #2531: Make float-to-decimal comparisons return correct results.

  Float to decimal comparison operations now return a result based on
  the numeric values of the operands.  Decimal.__hash__ has also been
  fixed so that Decimal and float values that compare equal have equal
  hash value.
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  r79588 | mark.dickinson | 2010-04-02 11:17:07 +0100 (Fri, 02 Apr 2010) | 2 lines

  Issue #7279:  Make comparisons involving a Decimal sNaN signal InvalidOperation.
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  r79589 | mark.dickinson | 2010-04-02 11:35:12 +0100 (Fri, 02 Apr 2010) | 6 lines

  Issue #7279:  Make Decimal('nan') hashable.  Decimal('snan') remains unhashable.

  Also rewrite the Decimal __hash__ method so that it doesn't rely on
  float('inf') being valid: float('inf') could raise an exception on
  platforms not using IEEE 754 arithmetic.
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Mark Dickinson 2010-04-03 11:08:14 +00:00
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Doc/library/decimal.rst
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@ -358,6 +358,24 @@ Decimal objects
compared, sorted, and coerced to another type (such as :class:`float` or
:class:`int`).
Decimal objects cannot generally be combined with floats in
arithmetic operations: an attempt to add a :class:`Decimal` to a
:class:`float`, for example, will raise a :exc:`TypeError`.
There's one exception to this rule: it's possible to use Python's
comparison operators to compare a :class:`float` instance ``x``
with a :class:`Decimal` instance ``y``. Without this exception,
comparisons between :class:`Decimal` and :class:`float` instances
would follow the general rules for comparing objects of different
types described in the :ref:`expressions` section of the reference
manual, leading to confusing results.
.. versionchanged:: 2.7
A comparison between a :class:`float` instance ``x`` and a
:class:`Decimal` instance ``y`` now returns a result based on
the values of ``x`` and ``y``. In earlier versions ``x < y``
returned the same (arbitrary) result for any :class:`Decimal`
instance ``x`` and any :class:`float` instance ``y``.
In addition to the standard numeric properties, decimal floating point
objects also have a number of specialized methods: