[Python-ideas] Delayed Execution via Keyword

Joseph Hackman josephhackman at gmail.com
Fri Feb 17 15:31:16 EST 2017

Couldn't the same thing be true of delayed if it is always followed by a colon?

x= delayed: slow_function()
print(delayed) # prints 1


> On Feb 17, 2017, at 2:39 PM, Mark E. Haase <mehaase at gmail.com> wrote:
>> On Fri, Feb 17, 2017 at 1:55 PM, Joshua Morton <joshua.morton13 at gmail.com> wrote:
>> but I'm wondering how common async and await were when that was proposed and accepted?
> Actually, "async" and "await" are backwards compatible due to a clever tokenizer hack. The "async" keyword may only appear in a few places (e.g. async def), and it is treated as a name anywhere else.The "await" keyword may only appear inside an "async def" and is treated as a name everywhere else. Therefore...
>     >>> async = 1
>     >>> await = 1
> ...these are both valid in Python 3.5. This example is helpful when proposing new keywords.
> More info: https://www.python.org/dev/peps/pep-0492/#transition-plan
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