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devel / comp.lang.python / Re: Are these good ideas?

SubjectAuthor
* Are these good ideas?Stephen Tucker
`- Re: Are these good ideas?Stefan Ram

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Are these good ideas?

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Subject: Are these good ideas?
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 by: Stephen Tucker - Mon, 14 Nov 2022 17:14 UTC

Hi,

I have two related issues I'd like comments on.

Issue 1 - Global Values

Some years ago, I had a situation where
(a) I could supply low-level functions that carry out tasks,
(b) I needed those functions to communicate with each other, but
(c) I had no access to the module that invoked my functions.

In order to achieve this, I hit on the idea that I also supply a module
that I describe as a "global values" module. This module …
(i) … defines the values that the functions use to communicate with each
other;
(ii) … is the subject of an import statement in each of my functions;
(iii) … initialises its values at the start of each run (since the import
only carries out an actual import once per session);
(iv) … acts as a repository for the values thereafter.

This solution works well.

Given that I am not particularly concerned about efficiency,
(1) Is this a reasonable way to achieve this goal?
(2) Do you know of any better ways?

Issue 2 - Passed Parameters

I am now facing another situation where I am wanting to pass 6 or 7
parameters down through several layers of logic (function A calling
function B calling ... ) and for results to be passed back.

Having had the idea described above, I am considering using it again to
save all the parameter-and-results passing.

I see nothing wrong with doing that, but I may well be missing something!

Comments, please!

Stephen Tucker.

Re: Are these good ideas?

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From: ram...@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: Are these good ideas?
Date: 14 Nov 2022 17:32:34 GMT
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 by: Stefan Ram - Mon, 14 Nov 2022 17:32 UTC

Stephen Tucker <stephen_tucker@sil.org> writes:
>Issue 1 - Global Values
>Some years ago, I had a situation where
>(a) I could supply low-level functions that carry out tasks,
>(b) I needed those functions to communicate with each other, but
>(c) I had no access to the module that invoked my functions.

One also could gather such functions in a class, then create
one object of this class in the client and call the functions
via this object. Your "globals" would become fields of this
object (class).

>I am now facing another situation where I am wanting to pass 6 or 7
>parameters down through several layers of logic (function A calling
>function B calling ... ) and for results to be passed back.

One could also gather these functions in a class and then
the client would create an object of this class passing the
seven values to the object on creation. Then he could
call the function A on this object, and A could call B from
the same object. Since the seven values are already stored
in the object, A would not have to pass them to B.
If the client would always call A after the object creation,
A also could be invoked directly from __init__. In this
case, the invocation of A would be replaced by the creation
of an object.

If no one else ever needs to call B, you could also define B
as a subfunction of A using a nested def statement. Then B
would already see the seven values passed to A.

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