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

[Terry Davis]

Terry Davis <terry.y.davis at gmail.com> added the comment:

If no one else has any comments, I'll assume there is consensus and start working on this. I have not contributed to CPython before, nor have I worked on production C code, so it may be a while before I get anywhere.

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versions: +Python 3.11 -Python 3.10

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