On Wed, Oct 21, 2020 at 1:03 PM David Mertz <me...@gnosis.cx> wrote:
>
> On Tue, Oct 20, 2020, 9:17 PM Chris Angelico
>>
>> Please explain how it's "spooky action at a distance" if it's a
>> self-contained assignment statement?
>
>
> I'm not Steven, but I think I'm the first one in the thread to use Einstein's
> phrase. As I understand your current semantics, that phrase is not the
> problem.
>
> My initial impression of your intent was:
>
> foo, bar = 42, 99
> # ... a million lines ...
> line = "123/"
> # ... more lines ...
> f"{foo}/{bar}" = line
> # raises if bar wasn't previously set
> # binds to prior value if it was set
>
> But I think what you want is for the binding line never to raise, but also
> not to have any local means to know whether 'bar' is a name after that line.
> Or whether 'foo' is, for that matter.
>
Easy: it always is. Whether it has had a value assigned to it is a
separate consideration. Consider:
if cond: x = 1
Is x a name after this line? Yes, yes it is. There's nothing spooky
happening here.
ChrisA
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