[Python-Dev] PEP 492 vs. PEP 3152, new round (original) (raw)

Greg Ewing greg.ewing at canterbury.ac.nz
Mon Apr 27 14:52:25 CEST 2015

Yury Selivanov wrote:

I've done some experiments with grammar, and it looks like we indeed can parse await quite differently from yield. Three different options:

You don't seem to have tried what I suggested, which is to make 'await' a unary operator with the same precedence as '-', i.e. replace

factor: ('+'|'-'|'~') factor | power

with

factor: ('+'|'-'|'~'|'await') factor | power

That would allow

await a() res = await a() + await b() res = await await a() if await a(): pass return await a() print(await a()) func(arg=await a()) await a() * b()

-- Greg

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