docs: def get_network(families=[socket.AF_INET]):
      """
      # >>> from psutil._common import snic
      >>> import mock
      >>> from collections import namedtuple
      >>> snic = namedtuple('snic', ['family', 'address', 'netmask', 'broadcast', 'ptp'])
      >>> MOCK = {
      ... "awdl0": [snic(family=30, address="fe80::3854:80ff:fe54:7bf8%awdl0", netmask="ffff:ffff:ffff:ffff::", broadcast=None, ptp=None)],
      ... "en0":   [snic(family=2, address="192.168.10.200", netmask="255.255.255.0", broadcast="192.168.10.255", ptp=None),
      ...           snic(family=30, address="fe80::6e40:8ff:feac:4f94%en0", netmask="ffff:ffff:ffff:ffff::", broadcast=None, ptp=None)],
      ... "bridge0": [snic(family=18, address="6e:40:08:ca:60:00", netmask=None, broadcast=None, ptp=None)],
      ... "lo0": [snic(family=2, address="127.0.0.1", netmask="255.0.0.0", broadcast=None, ptp=None),
      ...         snic(family=30, address="fe80::1%lo0", netmask="ffff:ffff:ffff:ffff::", broadcast=None, ptp=None)]}
  
      >>> with mock.patch("psutil.net_if_addrs", side_effect=lambda: MOCK):
      ...     data_inet = get_network([socket.AF_INET])
      ...     sorted(data_inet.keys())
      ['en0', 'lo0']
  
      >>> with mock.patch("psutil.net_if_addrs", side_effect=lambda: MOCK):
      ...     sorted(data_inet.values())
      [[u'127.0.0.1/255.0.0.0'], [u'192.168.10.200/255.255.255.0']]
  
      >>> with mock.patch("psutil.net_if_addrs", side_effect=lambda: MOCK):
      ...     data_inet6 = get_network([socket.AF_INET6])
      ...     sorted(flatten(data_inet6.values()))
      ['fe80::1%lo0/ffff:ffff:ffff:ffff::', 'fe80::3854:80ff:fe54:7bf8%awdl0/ffff:ffff:ffff:ffff::', 'fe80::6e40:8ff:feac:4f94%en0/ffff:ffff:ffff:ffff::']
      """
      nic = psutil.net_if_addrs()
  
      ips = defaultdict(list)
      # return nic
      for card, addresses in nic.items():
          for address in addresses:
              if address.family in families:
                  ips[card].append("{0.address}/{0.netmask}".format(address))
      return dict(ips)