All permutations from 2 lists

[2QdxY4RzWzUUiLuE at potatochowder.com]

On 2022-03-01 at 19:12:10 -0500,
Larry Martell <larry.martell at gmail.com> wrote:

> If I have 2 lists, e.g.:
> 
> os = ["Linux","Windows"]
> region = ["us-east-1", "us-east-2"]
> 
> How can I get a list of tuples with all possible permutations?
> 
> So for this example I'd want:
> 
> [("Linux", "us-east-1"), ("Linux", "us-east-2"), ("Windows",
> "us-east-1"), "Windows", "us-east-2')]
> 
> The lists can be different lengths or can be 0 length. Tried a few
> different things with itertools but have not got just what I need.

[(o, r) for o in os for r in region]

Feel free to import itertools, but it's not really necessary.  ;-)