[Python-ideas] Fwd: Fwd: Fwd: unpacking generalisations for list comprehension

[Brendan Barnwell]

On 2016-10-17 16:35, Steven D'Aprano wrote:
>> >and many times I have been irritated by the fact that the
>> >one-item-per-loop invariant exists.  I'm not sure whether I'm in favor of
>> >this particular syntax, but I'd like to be able to do the kind of things it
>> >allows.  But doing them inherently requires breaking the invariant you
>> >describe.
> That last point is incorrect. You already can do the kind of things this
> thread is about:
>
>      [*t for t in iterable]  # proposed syntax: flatten
>
> can be written as:
>
>      [x for t in iterable for x in t]

	Right, but by "doing those kinds of things" I mean doing them more in a 
more conise way without an extra level of iteration.  (You can "do 
multiplication" by adding repeatedly, but it's still nice to have 
multiplication as an operation.)

-- 
Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is no 
path, and leave a trail."
    --author unknown