[Python-ideas] math.inf and math.nan constants

Alexander Belopolsky alexander.belopolsky at gmail.com
Wed Jan 7 17:07:28 CET 2015

On Wed, Jan 7, 2015 at 10:23 AM, Marco Buttu <marco.buttu at gmail.com> wrote:

> On 07/01/2015 15:58, Todd wrote:
>  Yes, this would be a shortcut for that.  math.nan and math.inf are less
>> verbose than float("nan") and float("inf"), even if you aren't already
>> using the math module (fewer characters total, and in particular fewer
>> special characters).  It would also, at least in my opinion, be more
>> readable.  Plus there is already the math.isnan and math.isinf, so I don't
>> think it would be totally out-of-place.
> I totally agree. +1

Another +1.

Two points:

1. The current ways to create inf and nan are not obvious and hard to
discover.  It will be nice to have these constants discoverable in tab
completion from math.

2. The repr()s of nan and inf are simply 'nan' and 'inf', not
'float("nan")' and 'float("inf")', so it is natural to expect nan and inf
constants in some namespace.
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