Minus operator versus unary minus

Sat May 30 05:32:50 EDT 2015

On 30.05.15 12:09, Peter Otten wrote:
> Serhiy Storchaka wrote:
>> On 30.05.15 10:56, Peter Otten wrote:
>>> The following modification of the collections.Counter implementation
>>>>>> https://hg.python.org/cpython/rev/fe4efc0032b5
>>>>>> was just checked in with the line
>>>>>> result[elem] = 0 - count
>>>>>> Does this have an advantage over the obvious
>>>>>> result[elem] = -count
>>>>>> ?
>>>>>>> x = 0.0
>>>>> -x
>> -0.0
>>>>>>>>> 0 - x
>> 0.0
>> That's a subtle difference, but does it matter in the context of the patch?

I don't know. Perhaps there is more meaningful difference for decimals.
This code is not new (see
https://hg.python.org/cpython/rev/e908ebc160f0).