[Python-Dev] Decimal & amp; lt; -& amp; gt; float comparisons in py3k.

[Nick Coghlan]

Greg Ewing wrote:
> Antoine Pitrou wrote:
> 
>> We forbid comparisons when there is a real danger or ambiguity, such
>> as unicode
>> vs. bytes. There is no such danger or ambiguity when comparing a
>> decimal with a
>> float.
> 
> So do you think that float("0.1") and Decimal("0.1") should be
> equal or not, and why?

Note that Antoine's point was that float("0.1") and
Decimal.from_float(0.1) should compare equal. The latter exactly matches
the underlying binary floating point value:

>>> dec.from_float(0.1)
Decimal('0.1000000000000000055511151231257827021181583404541015625')

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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