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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I prefer simpler and more strict rule:

* Underscores are allowed only between digits in numeric literals.

Thus 1__2, 12_, 1_.2, 1_e2, 1e_2, 1_j, 0x_12 are not allowed.

It is easier to make the rule more lenient later if it will be needed.

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nosy: +serhiy.storchaka

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