how to modify detail and list of viewset drf code example

Example 1: drf viewsets

class AccountViewSet(viewsets.ReadOnlyModelViewSet):
    """
    A simple ViewSet for viewing accounts.
    """
    queryset = Account.objects.all()
    serializer_class = AccountSerializer

Example 2: get_permissions

def get_permissions(self):
    # Your logic should be all here
    if self.request.method == 'GET':
        self.permission_classes = [DummyPermission, ]
    else:
        self.permission_classes = [IsAuthenticated, ]

    return super(UsersViewSet, self).get_permissions()