Can one output something other than 'nan' for not a number values?

[dn]

On 20/02/24 01:04, Chris Green via Python-list wrote:
> dn <PythonList at danceswithmice.info> wrote:
>> On 18/02/24 09:53, Grant Edwards via Python-list wrote:
>>> On 2024-02-17, Cameron Simpson via Python-list <python-list at python.org> wrote:
>>>> On 16Feb2024 22:12, Chris Green <cl at isbd.net> wrote:
>>>>> I'm looking for a simple way to make NaN values output as something
>>>>> like '-' or even just a space instead of the string 'nan'.
>>>>> [...]
>>>>>
>>>>>      Battery Voltages and Currents
>>>>>      Leisure Battery - 12.42 volts  -0.52 Amps
>>>>>      Starter Battery -   nan volts    nan Amps
>>>>>
>>>>> What I would like is for those 'nan' strings to be just a '-' or
>>>>> something similar.
>>>
>>>> The simplest thing is probably just a function writing it how you want
>>>> it:
>>>>
>>>>        def float_s(f):
>>>>            if isnan(f):
>>>>                return "-"
>>>>            return str(f)
>>>>
>>>> and then use eg:
>>>>
>>>>        print(f'value is {float_s(value)}')
>>>>
>>>> or whatever fits your code.
>>>
>>> Except he's obviously using some sort of formatting to control the
>>> number of columns and decimal places, so 'str(f)' is not going to cut
>>> it. Is the basic floating point number formatting functionality seen
>>> when using f-strings or '%' operator part of the float type or is it
>>> part of the f-string and % operator?
>>
>> It's part of the PSL's string library: "Format Specification
>> Mini-Language"
>> https://docs.python.org/3/library/string.html#format-specification-mini-language
>>
>> Has the OP stated if we're talking 'Python' or numpy, pandas, ...?
>>
> Just python, on a Raspberry Pi, so currently Python 3.9.2.

Concur with earlier advice (and assuming is only a consideration during 
output) - use if.

Alternately, encode appropriately during the data-capture phase.


-- 
Regards,
=dn