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

[Random832]

On Thu, Oct 13, 2016, at 15:46, Random832 wrote:
> so,  under a similar 'transformation', "*foo for foo in bar" likewise
> becomes "def f(): for foo in bar: yield from foo"
> 
> bar = [(1, 2), (3, 4)]
> (*(1, 2), *(3, 4)) == == tuple(f())
> [*(1, 2), *(3, 4)] == == list(f())


I accidentally hit ctrl-enter while copying and pasting, causing my
message to go out while my example was less thorough than intended and
containing syntax errors. It was intended to read as follows:

..."*foo for foo in bar" likewise becomes

def f():
    for foo in bar:
        yield from foo

a, b = (1, 2), (3, 4)
bar = [a, b]
(*a, *b) == (1, 2, 3, 4) == tuple(f()) # tuple(*foo for foo in bar)
[*a, *b] == [1, 2, 3, 4] == list(f()) # [*foo for foo in bar]