initializing "parameters" class in Python only once?

[Mark Lawrence]

On 14/07/2014 23:32, Catherine M Moroney wrote:
> 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

Besides the answers you've already had, you might like to consider using 
the enum module for some of your parameters.  IIRC it's only available 
in 3.4 but there's what I understand to be pretty much the same thing on 
pypi.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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