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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