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Thu Aug 20 06:55:33 CEST 2009 · http://mail.python.org/pipermail/python-dev/2009-August/091269.html

On Wed, Aug 19, 2009 at 9:07 PM, Eric Smith<eric at trueblade.com> wrote:
> Fred Drake wrote:
>>
>> On Aug 19, 2009, at 6:01 PM, Peter Moody wrote:
>>>
>>> just to double check, it's fine for IPNetwork to remain hashable if
>>> set_prefix() actually returned a new object, correct?
>>
>>
>> The name would be confusing, though.  Perhaps using_prefix() would be more
>> clear.
>
> I think you'd be better off either doing this with an optional parameter to
> __init__, or a class method factory function (maybe from_prefix or similar).
> I don't see why it should be a method on an existing object.
>

while not the the prettiest, you can already (ignoring the set_prefix)
do something like:

>>> newobject = ipaddr.IP(str(o.network) + "/new prefix")

Is this sufficient?

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IP Address Manipulation Library for the Python Standard Library