[issue42914] pprint numbers with underscore

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

>>> format(10**9, '_d')
'1_000_000_000'

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42914>
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