docs: def _get_ipv4_addrs(self):
          """
          Returns the IPv4 addresses associated with this NIC. If no IPv4
          addresses are used, then empty dictionary is returned.
          """
          addrs = self._get_addrs()
          ipv4addrs = addrs.get(netifaces.AF_INET)
          if not ipv4addrs:
              return {}
          return ipv4addrs[0]