2's complement conversion. Is this right?

[John Machin]

Ross Ridge wrote:
> Ross Ridge <rri... at caffeine.csclub.uwaterloo.ca> wrote:
>> It's the same as the previous version except that it "precompiles"
>> the struct.unpack() format string. =A0It works similar to the way Python
>> handles regular expressions.
> 
> George Sakkis  <george.sakkis at gmail.com> wrote:
>> I didn't know about the Struct class; pretty neat. It's amazing that
>> this version without Psyco is as fast Bob's version with Psyco!
> 
> Unfortunately, it doesn't seem to documented in the Python 2.5 manual.

It seems to me that it's documented:

http://docs.python.org/lib/struct-objects.html

The struct module doc page 
(http://docs.python.org/lib/module-struct.html) provides links but no 
explicit mention of the Struct class in its text.