On 23 November 2017 at 13:30, Antoine Pitrou <solip...@pitrou.net> wrote:
> On Thu, 23 Nov 2017 14:17:32 +0200 > Serhiy Storchaka <storch...@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
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