<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def del_current_vrf(self):
 """ Remove VRF to filter list session variable """


        vrf_id = int(request.json['vrf_id'])
        if vrf_id in session['current_vrfs']:
            del session['current_vrfs'][vrf_id]

            session.save()

        return json.dumps(session.get('current_vrfs', {}))