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Tue Mar 6 05:59:49 CET 2007 · https://mail.python.org/pipermail/python-dev/2007-March/071525.html

Eric V. Smith schrieb:
> I'm working on PEP 3101, Advanced String Formatting.  About the only 
> built-in numeric formatting I have left to do is for converting a 
> PyLongOjbect to binary.
> 
> I need to know how to access the bits in a PyLong.  

I think it would be a major flaw in PEP 3101 if you really needed it.
The long int representation should be absolutely opaque - even the
fact that it is a sign+magnitude representation should be hidden.

Looking at the PEP, I see that a class can implement __format__.
Wouldn't it be appropriate if the long type implemented that? 
Implementation-wise, I would expect that long_format already does the
bulk of what you need to do.

OTOH, also look at _PyString_FormatLong.

Regards,
Martin

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[Python-Dev] Access to bits for a PyLongObject