[Python-ideas] Async Lambda syntax

Nathaniel Smith njs at pobox.com
Fri May 18 21:41:01 EDT 2018

On Fri, May 18, 2018 at 1:53 PM, Noah Simon <noahs2003 at gmail.com> wrote:
> Hello all,
> I was developing a script using an asyncio-based API, when I came across the
> need to define an asynchronous lambda. I found this syntax does not
> currently exist. Obviously I could have (and did) just write a regular
> coroutine, but for simple one-line functions and such, I think an
> asynchronous lambda syntax would be useful. I do not have the experience to
> write a PEP or implement this, so I was wondering what you all think of the
> idea.
> What I was thinking:
> foo = async lambda a, b: b + await bar(a)

This is the obvious syntax: it's unambiguous and consistent with the
rest of the async/await syntax. Probably it's the only syntax worth
considering. The question will be: does the need actually come up
often enough in real life to be worth adding things to the language?

Do you have any examples? Can you show what you were actually trying
to do? Real examples are much more convincing than foo/bar examples.


Nathaniel J. Smith -- https://vorpus.org

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