[Python-Dev] PEP 515: Underscores in Numeric Literals (original) (raw)

Georg Brandl g.brandl at gmx.net
Thu Feb 11 07:14:48 EST 2016

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

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