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

[Grant Edwards]

On 2023-12-28, Peter J. Holzer via Python-list <python-list at python.org> wrote:
> On 2023-12-28 05:20:07 +0000, rbowman via Python-list wrote:
>> On Wed, 27 Dec 2023 03:53:42 -0600, Greg Walters wrote:
>> > The biggest caveat is that the shared variable MUST exist before it can
>> > be examined or used (not surprising).
>> 
>> There are a few other questions. Let's say config.py contains a variable 
>> like 'font' that is a user set preference or a calibration value 
>> calculated by A to keep with the thread title. Assuming both scripts are 
>> running, how does the change get propagated to B after it is set in A
>
> It isn't. The variable is set purely in memory. This is a mechanism to
> share a value between multiple modules used by the same process, not to
> share between multiple processes (whether they run the same or different
> scripts)
>
>> and written to the shared file?
>
> Nothing is ever written to a file.

Then how does it help the OP to propogate clibration values from one
program to another or from one program run to the next run?

> You could of course write python files from a python script (in fact I
> do this), but that's not what this pattern is about, AFAICS.