[Python-Dev] Re: PEP 649: Deferred Evaluation Of Annotations Using Descriptors, round 2

2021年4月14日 16:23:52 -0700

Baptiste Carvello wrote:
> Le 14/04/2021 à 19:44, Guido van Rossum a écrit :
> > No, what I heard is that, since in *most* cases the string quotes are
> > not needed, people are surprised and annoyed when they encounter cases
> > where they are needed.
> Well, I had assumed quotes would be used in all cases for consistency.
That does seem like a reasonable solution. Redundant, ugly, and annoying, but 
safe and consistent. Sort of like using type constraints in the first place. 
:D
> > ... the rule for finding the end of
> > an annotation would be very simple -- just skip words until the next
> > comma, close paren or colon, skipping matching brackets etc.
> ... But the hypothetic "def foo(prec:
> --precision int):" is already less readable. Will finding the closing
> comma or colon always be obvious to the human reader?
Nope. "--" sometimes means "ignore the rest of the line, including the ")". 
At the moment, I can't remember where I've seen this outside of SQL, but I can 
guarantee that if I read it late enough at night, the *best* case would be that 
I notice the ambiguity, guess correctly and am only annoyed.
-jJ
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