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

[Nick Coghlan]

On 27 March 2018 at 01:57, Guido van Rossum <guido at python.org> wrote:
> On Mon, Mar 26, 2018 at 7:57 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>> By contrast, the sublocals idea strives to keep the *lifecycle* impact
>> of naming a subexpression as negligible as possible - while a named
>> subexpression might live a little longer than it used to as an
>> anonymous subexpression (or substantially longer in the case of
>> compound statement headers), it still wouldn't survive past the end of
>> the statement where it appeared.
>
>
> But this is not new: if you use a for-loop to initialize some class-level
> structure  you have the same problem. There is also a standard solution
> (just 'del' it).

Right, but that's annoying, too, and adds "Am I polluting a namespace
I care about?" to something that would ideally be a purely statement
local consideration (and currently is for comprehensions and generator
expressions).

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia