[Python-Dev] PEP 3144: IP Address Manipulation Library for the Python Standard Library

[Peter Moody]

On Wed, Aug 19, 2009 at 8:39 AM, Eric Smith<eric at trueblade.com> wrote:
> Peter Moody wrote:
>>
>> On Wed, Aug 19, 2009 at 3:20 AM, Antoine Pitrou<solipsis at pitrou.net>
>> wrote:
>>>
>>> Le Tue, 18 Aug 2009 13:00:06 -0700, Peter Moody a écrit :
>>>>
>>>> Howdy folks,
>>>>
>>>> I have a first draft of a PEP for including an IP address manipulation
>>>> library in the python stdlib. It seems like there are a lot of really
>>>> smart folks with some, ahem, strong ideas about what an IP address
>>>> module should and shouldn't be so I wanted to solicit your input on this
>>>> pep.
>>>
>>> When you say :
>>>
>>> « the results of the first computation should be cached and only
>>> re-generated should the object properties change »
>>>
>>> does it mean that the objects are mutable? Would it make sense to make
>>> them immutable and therefore hashable (such as, e.g., datetime objects)?
>>
>> that's a good point. I'll implement __hash__ in the BaseIP class.
>
> But are the objects mutable? I haven't had time to deep dive on this yet,
> but I'd like to. I also use IPy and would like to some this in the stdlib.

you can't set them directly, if that's what you mean.

>>> import ipaddr
>>> o = ipaddr.IPv4Network('1.1.1.0/24')
>>> o.broadcast
IPv4Address('1.1.1.255')
>>> o.network
IPv4Address('1.1.1.0')
>>> o.broadcast = ipaddr.IPv4Address('1.1.1.127')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
>>> o.prefixlen = 25
>>> o.broadcast
IPv4Address('1.1.1.127')

> Eric.
>