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

MRAB python at mrabarnett.plus.com
Fri Feb 12 15:39:25 EST 2016 
On 2016-02-12 20:06, Chris Barker wrote:
> On Fri, Feb 12, 2016 at 1:00 AM, Paul Moore <p.f.moore at gmail.com
> <mailto:p.f.moore at gmail.com>> wrote:
>
>
>     I have no opinion on anything other than that whatever syntax is
>     implemented as long as it allows single underscores between digits,
>     such as
>
>     1_000_000
>
>     Everything else is irrelevant to me, and if I read code that uses
>     anything else, I'd judge it based on readability and style, and
>     wouldn't care about arguments that "it's allowed by the grammar".
>
>
> I totally agree -- and it's clear that other cultures group digits
> differently, so we should allow that, but while I'll live with it either
> way, I'd rather have it be as restrictive as possible rather than as
> unrestricted as possible. As in:
>
> no double underscores
> no underscore right before or after a period
> no underscore at the beginning or end.
> ....
>
> As Paul said, as long as I can do the above, I'll be fine, but I think
> everyone's source code will be a lot cleaner in the long run if you
> don't have the option of doing who knows what weird arrangement....
>
> As for the SS# example -- it seems a bad idea to me to store a SS#
> number as an integer anyway -- so all the weird IDs etc. formats aren't
> really relevant...
>
That also applies to telephone numbers, account numbers, etc. They 
aren't really numbers (you wouldn't do arithmetic on them) and might 
have leading zeros.
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