[Python-Dev] PEP 492: async/await in Python; v3 (original) (raw)

Walter Dörwald walter at livinglogic.de
Tue Apr 28 16:23:31 CEST 2015

On 28 Apr 2015, at 5:07, Yury Selivanov wrote:

Hi python-dev,

Another round of updates. Reference implementation has been updated: https://github.com/1st1/cpython/tree/await (includes all things from the below summary of updates + tests). [...] New Coroutine Declaration Syntax -------------------------------- The following new syntax is used to declare a coroutine:: async def readdata(db): pass Key properties of coroutines: * async def functions are always coroutines, even if they do not contain await expressions. * It is a SyntaxError to have yield or yield from expressions in an async function.

Does this mean it's not possible to implement an async version of os.walk() if we had an async version of os.listdir()?

I.e. for async code we're back to implementing iterators "by hand" instead of using generators for it.

[...]

Servus, Walter

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