RetroSearch Browse

Thu Nov 23 07:42:59 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-November/150772.html

On 23 November 2017 at 13:30, Antoine Pitrou <solipsis at pitrou.net> wrote:

> On Thu, 23 Nov 2017 14:17:32 +0200
> Serhiy Storchaka <storchaka at gmail.com> wrote:
> >
> > I used the "yield" statement, but I never used the "yield" expressions.
> > And I can't found examples. Could you please present a real-world use
> > case for the "yield" (not "yield from") expression?
>
> Of course I can.  "yield" expressions are important for writing
> Python 2-compatible asynchronous code while avoiding callback hell:
>
> See e.g. http://www.tornadoweb.org/en/stable/gen.html
>
> <https://mail.python.org/mailman/listinfo/python-dev>

Great, so I open this page and see this code:

results = []
for future in list_of_futures:
    results.append(yield future)

Interesting, why don't they use a comprehension for this and instead need
to invent a whole `tornado.gen.multi` function?

--
Ivan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20171123/1a81987c/attachment.html>

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://mail.python.org/pipermail/python-dev/2017-November/150772.html below:

[Python-Dev] Tricky way of of creating a generator via a comprehension expression