[Python-ideas] Explicit variable capture list

[Sven R. Kunze]

On 24.01.2016 06:16, Guido van Rossum wrote:
> I wonder if kids today aren't too much in love with local function
> definitions. :-) There's a reason why executor.submit() takes a
> function *and arguments*. If you move the function out of the for loop
> and pass the url as a parameter to submit(), problem solved, and you
> waste fewer resources on function objects and cells to hold nonlocals.
> A generation ago most people would have naturally used such a solution
> (since most languages didn't support the alternative :-).

Well said.

I remember js be a hatchery of this kind of programming. My main concern 
always was "how can I test these inner functions?" Almost impossible but 
a good excuse not to. So, it's unprofessional from my point of view but 
things may change.

On-topic: I like the way Python allows me to bind early. It's simple and 
that's the main argument for it and against introducing an yet-another 
syntax (like colons, brakes, etc.); especially for solving such a side 
issue.

Best,
Sven