code: def _address_family(address):
      
      if address.startswith('[') and address.endswith(']'):
          return socket.AF_INET6
      for af in (socket.AF_INET, socket.AF_INET6):
          try:
              socket.inet_pton(af, address)
              return af
          except (ValueError, AttributeError, socket.error):
              continue
      return socket.AF_UNSPEC
docs: Attempt to determine the family of an address (or hostname)
  
          :return: either socket.AF_INET or socket.AF_INET6 or socket.AF_UNSPEC if the address family
                   could not be determined