Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> It would be nice if pprint learned to insert underscores in long numbers

+1 but I would make this optional.


> Here is an implementation of the safe repr for numbers if helpful

I suggest using the existing string formatting tools as a foundation

    >>> format(10**9, ',d').replace(',', '_')
    '1_000_000_000'

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nosy: +rhettinger

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<https://bugs.python.org/issue42914>
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