I have this code

 class HNCS (ThreadingTCPServer):

    def verify_request(self, request, client_address):

        for key in connections:

            if connections[key].client_address[0] == client_address[0]:

                if client_address[0] != '127.0.0.1':

                    return False

        return True

    def welcome(self):

        return '''______________________________________________________
------------------------------------------------------
%s
______________________________________________________
------------------------------------------------------
* Server started %s
* Waiting for connections on port %i
''' % (gpl, ctime(), PORT)

I only can't figure out the line where it says if connections[key].client_address[0] == client_address[0]

how come we used client_address as an attribute after dictionary???