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

[Richard Damon via Python-list]

     On 12/28/2023 12:20 AM EST rbowman via Python-list
     <[1]python-list@python.org> 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
     and
     written to the shared file? Is there a mechanism to allow both scripts
     to
     make updates?

     The easy way out is to assume the changes will be picked up when the
     scripts are restarted but this is not always acceptable.

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   If one module does a:

   import config

   config.font = "New Value"

   Then every other module in that program that also did a

   import config

   will see the new value of that variable, as the assignment rebound the
   name in the module namespace to the new value.

   Note, it does NOT work if you did a

   from config import font

   font = "New Value"



   as that doesn't change the binding in the config module.

   IF you need to propagate to a different process, you need something
   different.


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