[Python-Dev] PEP 515: Underscores in Numeric Literals (revision 3)
Georg Brandl
g.brandl at gmx.net
Thu May 12 01:30:49 EDT 2016
I'm happy with the latest version.
Georg
On 05/11/2016 06:46 PM, Guido van Rossum wrote:
> If the authors are happy I'll accept it right away.
>
> (I vaguely recall there's another PEP that's ready for pronouncement -- but
> which one?)
>
> On Wed, May 11, 2016 at 9:34 AM, Brett Cannon <brett at python.org
> <mailto:brett at python.org>> wrote:
>
> Is there anything holding up PEP 515 at this point in terms of acceptance or
> implementation?
>
> On Sat, 19 Mar 2016 at 11:56 Guido van Rossum <guido at python.org
> <mailto:guido at python.org>> wrote:
>
> All that sounds fine!
>
> On Sat, Mar 19, 2016 at 11:28 AM, Stefan Krah <stefan at bytereef.org
> <mailto:stefan at bytereef.org>> wrote:
> > Guido van Rossum <guido <at> python.org <http://python.org>> writes:
> >> So should the preprocessing step just be s.replace('_', ''), or should
> >> it reject underscores that don't follow the rules from the PEP
> >> (perhaps augmented so they follow the spirit of the PEP and the letter
> >> of the IBM spec)?
> >>
> >> Honestly I think it's also fine if specifying this exactly is left out
> >> of the PEP, and handled by whoever adds this to Decimal. Having a PEP
> >> to work from for the language spec and core builtins (int(), float()
> >> complex()) is more important.
> >
> > I'd keep it simple for Decimal: Remove left and right whitespace (we're
> > already doing this), then remove underscores from the remaining string
> > (which must not contain any further whitespace), then use the IBM grammar.
> >
> >
> > We could add a clause to the PEP that only those strings that follow
> > the spirit of the PEP are guaranteed to be accepted in the future.
> >
> >
> > One reason for keeping it simple is that I would not like to slow down
> > string conversion, but thinking about two grammars is also a problem --
> > part of the string conversion in libmpdec is modeled in ACL2, which
> > would be invalidated or at least complicated with two grammars.
> >
> >
> >
> > Stefan Krah
> >
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>
> --
> --Guido van Rossum (python.org/~guido <http://python.org/~guido>)
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>
>
> --
> --Guido van Rossum (python.org/~guido <http://python.org/~guido>)
>
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