Mark Dickinson <dicki...@gmail.com> added the comment:

How common is this 'common practice'?  Could you point to some publicly 
available examples? Are there other languages that have built-in facilities for 
dealing with hexadecimal representations of integers in this way?

I think I've seen hex strings separated by spaces every four digits, and by 
spaces or colons every two digits (though the latter was usually used for 
something that's better seen as a sequence of bytes rather than a hexadecimal 
representation of a large integer).  I've rarely seen the underscore separation 
that you describe, but perhaps that's because I haven't been looking in the 
right places.

Do you have a concrete proposal for amending the formatting mini-language 
syntax to support this?  Perhaps you could run this past the python-ideas 
mailing list to try to get support and to thrash out the details of a possible 
specification?

To me this seems to be adding yet more complication to an already complicated 
formatting mini-language for something that few people will ever need, so I'd 
be -1 on this as it stands.

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<http://bugs.python.org/issue8062>
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