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

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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 needto 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>

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