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

[Antoine Pitrou]

Martin v. Löwis <martin <at> v.loewis.de> writes:
> [...]
> Then, class IPAddress has a method reverse_dns, which is defined
> as
> 
>     def reverse_dns(self):
>         """The reverse DNS lookup record for this IP address"""
>         return self._module.int_to_arpa(self._value)
> 
> So IPv4 addresses and IPv6 addresses share the same class, but instances
> have different values of _module.

Ok, thanks for the explanation. It looks like an inheritance-based approach
would allow for easier and more traditional introspection (e.g. `isinstance(ip,
IPv4Address)`). Not to mention that avoiding an indirection level can make
things faster.

Regards

Antoine.