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

[dn]

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, ...?

-- 
Regards,
=dn