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

Serhiy Storchaka storchaka at gmail.com
Thu Feb 11 05:17:00 EST 2016

On 11.02.16 00:20, Georg Brandl wrote:

Group 1: liberal (like this PEP)

* D [2] * Perl 5 (although docs say it's more restricted) [3] * Rust [4] * Swift (although textual description says "between digits") [5] Group 2: only between digits, multiple consecutive underscores * C# (open proposal for 7.0) [6] * Java [7] 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.

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