[Python-Dev] PEP 515: Underscores in Numeric Literals (revision 3)

[Guido van Rossum]

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> 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> 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 <at> 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)
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>


-- 
--Guido van Rossum (python.org/~guido)
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