initializing "parameters" class in Python only once?

From	Catherine M Moroney <Catherine.M.Moroney@jpl.nasa.gov>
Newsgroups	comp.lang.python
Subject	initializing "parameters" class in Python only once?
Date	2014-07-14 15:24 -0700
Organization	JPL Information Services, InterNetNews
Message-ID	<53C4589A.9040109@jpl.nasa.gov> (permalink)

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Hello,

Pardon me for not using the proper Python language terms, but I hope 
that people can still understand the question:

The problem:  I'm writing a large Python program and I have a bunch of
parameters (whose values are static) that I want to make available to
the rest of the code with minimum overhead and duplicate processing.

I think that the simplest way would be to create a file called 
"Params.py" and then simply have statements like a = 1, b = 2, etc.
in there (no classes, no methods, just a bunch of declarations).  But, 
some of these static parameters have to be calculated rather than simply 
hard-coded.

I thought of creating a class called Params and having a bunch of
methods (decorated with @classmethod) that set/calculate the value of
all the parameters.  Easy enough, but then I have to create a Params
object in every source file that uses these parameters, and that seems
wasteful.

The actual scope of the problem is very small, so memory/cpu time is not
an issue.  I'm just looking for the most pythonic/elegant way of doing this.

What is the recommended way of passing a bunch of static (hard-coded and 
calculated) parameters to various parts of the code?

Thank you for any advice,

Catherine

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Thread

initializing "parameters" class in Python only once? Catherine M Moroney <Catherine.M.Moroney@jpl.nasa.gov> - 2014-07-14 15:24 -0700
  Re: initializing "parameters" class in Python only once? Rob Gaddi <rgaddi@technologyhighland.invalid> - 2014-07-14 16:07 -0700
  Re: initializing "parameters" class in Python only once? Chris Kaynor <ckaynor@zindagigames.com> - 2014-07-14 16:21 -0700
  Re: initializing "parameters" class in Python only once? Ben Finney <ben@benfinney.id.au> - 2014-07-15 10:04 +1000
  Re: initializing "parameters" class in Python only once? Steven D'Aprano <steve@pearwood.info> - 2014-07-15 05:28 +0000
    Re: initializing "parameters" class in Python only once? alex23 <wuwei23@gmail.com> - 2014-07-17 13:35 +1000
      Re: initializing "parameters" class in Python only once? Steven D'Aprano <steve@pearwood.info> - 2014-07-17 04:27 +0000
      Re: initializing "parameters" class in Python only once? Ethan Furman <ethan@stoneleaf.us> - 2014-07-16 21:43 -0700

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