All permutations from 2 lists

[Larry Martell]

On Wed, Mar 2, 2022 at 5:00 PM Cameron Simpson <cs at cskk.id.au> wrote:
>
> On 02Mar2022 08:29, Larry Martell <larry.martell at gmail.com> wrote:
> >On Tue, Mar 1, 2022 at 7:32 PM Rob Cliffe <rob.cliffe at 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.