On Thu, Jun 17, 2021 at 12:37 AM Serhiy Storchaka <[email protected]>
wrote:
> And it is equivalent to pure Python code
>
> [x for chunk in list_of_lists for x in chunk]
>
Okay, slightly off-topic, but can we *please* allow
[*chunk for chunk in list_of_lists]
some day. I think it was left out because some discussion concluded it
would be too confusing, which is ridiculous. I assumed it would work and
was confused to find that it didn't. It's blatantly inconsistent.
It's not even the performance I care about, it's the unreadability of
having an extra "for i_have_to_think_of_yet_another_variable_name in
whatever" at the end of the list comprehension (at maximum distance from
where the variable is used). I've wished for this feature ridiculously many
times.
> It would be
> possible to make the compiler recognizing such pattern and generating
> more efficient bytecode (LIST_EXTEND instead of an internal loop with
> LIST_APPEND), but I am not sure that this case is common enough to
> complicate the compiler.
>
In my personal experience it's very common.
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