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

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.