what does := means simply?

[Chris Angelico]

On Fri, May 18, 2018 at 3:34 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> On Thu, 17 May 2018 15:50:17 +0100, bartc wrote:
>
>> Of course, full-on Python code is pretty much impossible to port
>> anywhere else anyway.
>
> Oh, I forgot to mention... given that Python is frequently used to
> prototype applications before the production-ready application is written
> in C, C++ or Java, the idea that Python code (whether "full on" or
> otherwise) cannot be ported is especially silly.
>

I'm morbidly curious as to what "half-on Python code" would look like.

ChrisA