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

Nick Coghlan ncoghlan at gmail.com
Wed Aug 19 23:44:17 CEST 2009

Peter Moody wrote:
> you can't set them directly, if that's what you mean.
>>>> import ipaddr
>>>> o = ipaddr.IPv4Network('')
>>>> o.broadcast
> IPv4Address('')
>>>> o.network
> IPv4Address('')
>>>> o.broadcast = ipaddr.IPv4Address('')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: can't set attribute
>>>> o.prefixlen = 25
>>>> o.broadcast
> IPv4Address('')

IPAddress instances should definitely be hashable, but as long as
"prefixlen" is mutable, IPNetwork instances should *not* be hashable,
since their value can change.

If prefixlen was made read only, then IPNetwork instances could also be
made hashable. In that case, changing the prefix length would then have
to be done by creating a new instance.


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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