[Python-Dev] PEP 515: Underscores in Numeric Literals (revision 3) (original) (raw)
Brett Cannon brett at python.org
Wed May 11 12:34:10 EDT 2016
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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> wrote:
All that sounds fine!
On Sat, Mar 19, 2016 at 11:28 AM, Stefan Krah <stefan at bytereef.org> wrote: > Guido van Rossum <guido 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 > _> ________________________ > Python-Dev mailing list > Python-Dev at python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/guido%40python.org
-- --Guido van Rossum (python.org/~guido)
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