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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _prepare_route(self, attrs):
 """Take a given inbound list for a route and parse it creating the route and importing the class it belongs to. :param list attrs: Route attributes :rtype: list """

        if type(attrs) not in (list, tuple):
            LOGGER.error('Invalid route, must be a list or tuple: %r', attrs)
            return

        # By default there are not any extra kwargs
        kwargs = None

        # If there is a regex based route, set it up with a raw string
        if attrs[0] == 're':
            route = r'%s' % attrs[1]
            classpath = attrs[2]
            if len(attrs) == 4:
                kwargs = attrs[3]
        else:
            route = r'%s' % attrs[0]
            classpath = attrs[1]
            if len(attrs) == 3:
                kwargs = attrs[2]

        LOGGER.debug('Initializing route: %s with %s', route, classpath)
        try:
            handler = self._import_class(classpath)
        except ImportError as error:
            LOGGER.error('Class import error for %s: %r', classpath, error)
            return None

        # Setup the prepared route, adding kwargs if there are any
        prepared_route = [route, handler]
        if kwargs:
            prepared_route.append(kwargs)

        # Return the prepared route as a tuple
        return tuple(prepared_route)