On Thu., 27 Feb. 2020, 2:03 am Guido van Rossum, <gu...@python.org> wrote:
> On Wed, Feb 26, 2020 at 7:43 AM Claudio Jolowicz <cjolow...@gmail.com>
> wrote:
>
>> In my experience, the expression `value |= other` is a common idiom across
>> programming languages to provide a default for `value` if it is "unset".
>>
>
> Interesting. Can you point to specific examples of this? In what other
> languages have you seen this? (Not that it would make us change PEP 584,
> but if this appears common we could probably warn about it prominently in
> docs and tutorials.)
>
I was thinking that bash scripting might be an example, but I double
checked, and that's spelled 'VAR="${$VAR:-default value}" '
make has 'VAR ?= "default value"'
C# uses "??=" for null coalescence on assignment.
So I've also never come across "|=" being used for this purpose.
Cheers,
Nick.
>
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