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

[Georg Brandl]

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.

cheers,
Georg