[Python-ideas] PEP 572: Statement-Local Name Bindings

[Ethan Furman]

On 02/28/2018 12:16 PM, Alex Walters wrote:

> For what its worth, I'm +1 on it.
>
> I actually like that it would allow:
>
> while (something() as var):
>      something_else(var)
>
> ...without being a bug magnet.  The bug magnet isn't the assignment of a
> name in the condition of a while loop, it's the fact that assignment is a
> simple typo away from comparison.  This is not a simple typo away from
> comparison (the operands are a different order, too).

I also like the above, but as a more general assignment-in-expression, not as a statement-local -- the difference being 
that there would be no auto-deletion of the variable, no confusion about when it goes away, no visual name collisions 
(aside from we have already), etc., etc.

Maybe I'll write yet-another-competing-PEP.  ;)

--
~Ethan~