[issue26331] Tokenizer: allow underscores for grouping in numeric literals

[Yury Selivanov]

Yury Selivanov added the comment:

> I prefer simpler and more strict rule:
> * Underscores are allowed only between digits in numeric literals.

+1.  But in any case we need a PEP for this change.

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nosy: +yselivanov

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<http://bugs.python.org/issue26331>
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