[Python-ideas] PEP 572: Statement-Local Name Bindings, take three!

[Rob Cliffe]

On 24/03/2018 16:02, Steven D'Aprano wrote:
>
> Yes, I get functions, and I think function-scope is a sweet spot between
> too few scopes and too many. Remember the bad old days of BASIC when all
> variables were application-global? Even if you used GOSUB as a
> second-rate kind of function, all the variables were still global.
>
> On the other hand, introducing sub-function scopes is, I strongly
> believe, too many.
>
>
We are all entitled to our beliefs.
But the decision was made to stop a for-variable from leaking from a 
list comprehension - you may not agree with that decision, but it was 
presumably a reasonable one.
Using SLNBs that don't leak into the surrounding local scope is ISTM a 
similar decision, and one that, if made, would be made for similar reasons.
Rob Cliffe