[issue43624] Add underscore as a decimal separator for string formatting

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

IIRC there is ISO recommending that after the decimal point, digits be arranged in groups of five.  I think is also how printed reference tables are typically formatted.

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nosy: +mark.dickinson, rhettinger, serhiy.storchaka

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<https://bugs.python.org/issue43624>
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