<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def user_login_failed( self, sender, credentials: dict, request: AxesHttpRequest = None, **kwargs ):
 # pylint: disable=too-many-locals """ When user login fails, save attempt record in cache and lock user out if necessary. :raises AxesSignalPermissionDenied: if user should be locked out. """


        if request is None:
            log.error('AXES: AxesCacheHandler.user_login_failed does not function without a request.')
            return

        username = get_client_username(request, credentials)
        client_str = get_client_str(username, request.axes_ip_address, request.axes_user_agent, request.axes_path_info)

        if self.is_whitelisted(request, credentials):
            log.info('AXES: Login failed from whitelisted client %s.', client_str)
            return

        failures_since_start = 1 + self.get_failures(request, credentials)

        if failures_since_start > 1:
            log.warning(
                'AXES: Repeated login failure by %s. Count = %d of %d. Updating existing record in the cache.',
                client_str,
                failures_since_start,
                settings.AXES_FAILURE_LIMIT,
            )
        else:
            log.warning(
                'AXES: New login failure by %s. Creating new record in the cache.',
                client_str,
            )

        cache_key = get_client_cache_key(request, credentials)
        self.cache.set(cache_key, failures_since_start, self.cache_timeout)

        if failures_since_start >= settings.AXES_FAILURE_LIMIT:
            log.warning('AXES: Locking out %s after repeated login failures.', client_str)

            user_locked_out.send(
                'axes',
                request=request,
                username=username,
                ip_address=request.axes_ip_address,
            )

            raise AxesSignalPermissionDenied('Locked out due to repeated login failures.')