code: def assign_user_policies(user, *policies_roles):
      
      clear_user_policies(user)
      pset = PermissionSet.objects.by_policies_and_roles(policies_roles)
      pset.refresh()
      if user is None:
          pset.anonymous_user = True
      else:
          pset.users.add(user)
      pset.save()
      cache.set(user_cache_key(user), None)
docs: Assign a sequence of policies to a user (or the anonymous user is
      ``user`` is ``None``).  (Also installed as ``assign_policies``
      method on ``User`` model.