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

[Greg Ewing]

Steven D'Aprano wrote:

> py> def gen():
> ...     for t in [(1, 'a'), (2, 'b'), (3, 'c')]:
> ...             yield *t
>   File "<stdin>", line 3
>     yield *t
>           ^
> SyntaxError: invalid syntax
> 
> Even if it was allowed, what would it mean? It could only mean "unpack 
> the sequence t, and collect the values into a tuple; then yield the 
> tuple".

To maintain the identity

   list(*x for x in y) == [*x for x in y]

it would be necessary for the *x in (*x for x in y) to expand
to "yield from x".

-- 
Greg