[Python-ideas] Improve readability of long numeric literals

[Manuel Cerón]

On Wed, Feb 10, 2016 at 12:51 AM, Guido van Rossum <guido at python.org> wrote:

> I don't know what a bank sort code is (maybe a UK thing?)
>
> FWIW there are some edge cases to be decided: is _123 valid? or 123_?
> or 123__456?
>

_123 is a valid identifier name, so no. For consistency, I think the
leading underscore should be out too.

Multiple underscores in the middle might be useful for separating millions
and thousands:

700__000_000

but perhaps it's too much.
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