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devel / comp.lang.python / Re: All permutations from 2 lists

Re: All permutations from 2 lists

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From: larry.ma...@gmail.com (Larry Martell)
Newsgroups: comp.lang.python
Subject: Re: All permutations from 2 lists
Date: Wed, 2 Mar 2022 17:05:28 -0500
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by: Larry Martell - Wed, 2 Mar 2022 22:05 UTC

On Wed, Mar 2, 2022 at 5:00 PM Cameron Simpson <cs@cskk.id.au> wrote:
>
> On 02Mar2022 08:29, Larry Martell <larry.martell@gmail.com> wrote:
> >On Tue, Mar 1, 2022 at 7:32 PM Rob Cliffe <rob.cliffe@btinternet.com> wrote:
> >> I think itertools.product is what you need.
> >> Example program:
> >>
> >> import itertools
> >> opsys = ["Linux","Windows"]
> >> region = ["us-east-1", "us-east-2"]
> >> print(list(itertools.product(opsys, region)))
> >
> >This does not work if region = []. I wrote in question that either
> >list could be empty.
>
> What do you want to get if a list is empty? You haven't said. My
> personal expectation would be an empty result.
>
> Alternatively, if you expect an empty list to imply some single default
> the the experession:
>
> the_list or (the_default,)
>
> might be of use.

I've solved the issue.

Subject	Author
Re: All permutations from 2 lists	Larry Martell