[issue27080] Implement the formatting part of PEP 515, '_' in numeric literals.

[Eric V. Smith]

Eric V. Smith added the comment:

I also fixed the code so both '_' and ',' can't be specified, and added tests. The documentation is also updated.

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resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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<http://bugs.python.org/issue27080>
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