Serhiy Storchaka added the comment:

> The idea is that modifier (such as "!" would require a width argument (the 
> signed representation only make sense in fixed width concepts as every 
> assembly language programmer knows).  Its presence would also imply the "0".

I would use the precision for this. Truncating the number of digits in integer 
representation is similar to truncating the number of characters for strings.

But actually I don't think we should add such feature in the core. It has very 
limited application. This can be implemented as a third-part library.

Actually I think the stdlib needs something like bitarray and/or bitset. The 
specially purposed types that allow testing and modifying separate bits and bit 
ranges.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30571>
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