docs: def get_if_addr6(iff):
      """
      Returns the main global unicast address associated with provided
      interface, in human readable form. If no global address is found,
      None is returned.
      """
      return next((x[0] for x in in6_getifaddr()
                   if x[2] == iff and x[1] == IPV6_ADDR_GLOBAL), None)