[Python-Dev] PEP 515: Underscores in Numeric Literals

[Serhiy Storchaka]

On 11.02.16 14:14, Georg Brandl wrote:
> On 02/11/2016 11:17 AM, Serhiy Storchaka wrote:
>
>>> **Group 3: only between digits, only one underscore**
>>>
>>> * Ada [8]_
>>> * Julia (but not in the exponent part of floats) [9]_
>>> * Ruby (docs say "anywhere", in reality only between digits) [10]_
>>
>> C++ is in this group too.
>>
>> The documentation of Perl explicitly says that Perl is in this group too
>> (23__500 is not legal). Perhaps there is a bug in Perl implementation.
>> And may be Swift is intended to be in this group.
>>
>> I think we should follow the majority of languages and use simple rule:
>> "only between digits".
>>
>> I have provided an implementation.
>
> Thanks for the alternate patch.  I used the two-function approach you took
> in ast.c for my latest revision.
>
> I still think that some cases (like two of the examples in the PEP,
> 0b_1111_0000 and 1.5_j) are worth having, and therefore a more relaxed
> rule is preferable.

Should I write an alternative PEP for strong rule?