from django.contrib.auth.decorators import login_required, user_passes_test

def is_authorised(user):
    if user:
        return user.groups.filter(name__in=['admin_group', 'user_group',]).exists()
    return False

@login_required
@user_passes_test(is_authorised)
def authorised_page(request):
    # View to authorised page...
    pass