How/where to store calibration values - written by program A, read by program B

[Thomas Passin]

On 12/5/2023 11:50 AM, MRAB via Python-list wrote:
> On 2023-12-05 14:37, Chris Green via Python-list wrote:
>> Is there a neat, pythonic way to store values which are 'sometimes'
>> changed?
>>
>> My particular case at the moment is calibration values for ADC inputs
>> which are set by running a calibration program and used by lots of
>> programs which display the values or do calculations with them.
>>
>>  From the program readability point of view it would be good to have a
>> Python module with the values in it but using a Python program to
>> write/update a Python module sounds a bit odd somehow.
>>
>> I could simply write the values to a file (or a database) and I
>> suspect that this may be the best answer but it does make retrieving
>> the values different from getting all other (nearly) constant values.
>>
>> Are there any Python modules aimed specifically at this sort of
>> requirement?
>>
> Some kind of key/value store sounds like the correct solution. I 
> wouldn't go as far a database - that's overkill for a few calibration 
> values.
> 
> I might suggest TOML, except that Python's tomllib (Python 3.11+) is 
> read-only!
> 
> Personally, I'd go for lines of:
> 
>      key1: value1
>      key2: value2
> 
> Simple to read, simple to write.

Just go with an .ini file. Simple, well-supported by the standard 
library. And it gives you key/value pairs.