#try to import those and get the keys
        for engine in engines:
            try:
                print('Importing ... ' + engine)
                __import__('engines.' + engine, globals=globals(), level=-1)
            except Exception as e:
                print('File: %s: import error %s' %(engine, str(e)) )

        for klass in AbstractLookupEngine.__subclasses__():
            print('Creating instance of '+ str(klass.__name__))
            object = klass()
            print (dir(object))
            self.register_engine(object)

   def _find_all_engines(self):
        # get the file name of the all the .py files
        return [ x[:-3]
                    for x in os.listdir(self._engines_dir)
                        if x.endswith('.py') and not x in self._ignored_list ]