[feature request] Type compatibility with ipaddress

[brent s.]

Hi! With python 3.x (and MAYBE 2.7?), ipaddress is now a standard library.

It'd be great if netaddr could parse those objects into native objects(A) and have a native library object attribute(B), e.g.:

#!/usr/bin/env python3

import ipaddress
import netaddr

ip4 = ipaddress.ip_address('192.0.2.1')  # instance of ipaddress.IPv4Address
ip6 = ipaddress.ip_address('2001:DB8::1')  # instance of ipaddress.IPv6Address
net4 = ipaddress.ip_network('192.0.2.0/24')  # instance of ipaddress.IPv4Network
net6 = ipaddress.ip_network('2001:DB8::/32')  # instance of ipaddress.IPv6Network

# "A"
n_ip4 = netaddr.IPAddress(ip4)  # instance of netaddr.ip.IPAddress using above
n_ip6 = netaddr.IPAddress(ip6)  # instance of netaddr.ip.IPAddress using above
n_net4 = netaddr.IPNetwork(net4)  # instance of netaddr.ip.IPNetwork using above
n_net6 = netaddr.IPNetwork(net6)  # instance of netaddr.ip.IPNetwork using above

# "B"
isinstance(n_ip4.ipaddress, ipaddress.IPv4Address)  # This attribute would exist and this test would be True.

Thoughts?

[brent s.]

A should be fairly easy; the str() conversion for ipaddress.IPv4Address/ipaddress.IPv6Address is the string representation that netaddr.IPAddress() accepts.

LIkewise, for ipaddress.IPv4Network/ipaddress.IPv6Network str() conversions, it's in the standard network/prefix format (e.g. 192.0.2.0/24).

[Jakub Stasiak]

I agree, looks convenient.

[KOLANICH]

Since ipaddress is in the standard library, how about removing the impl duplicating the impl there and just reuse the impl that is already in the standard library?

[Jakub Stasiak]

I'm happy to accept a pull request that keeps the current interface but reuses the standard library implementation (Python 3.6+ is fine as we're about to drop 2.7 and 3.5 compatibility anyway).