@Override
      public void visitPyReferenceExpression(@NotNull PyReferenceExpression node) {
        if (node.textMatches(expression) && !isValidReference(node.getReference())) {
          result.add(node);
        }
        super.visitPyReferenceExpression(node);
      }
@Override
      public void visitPyReferenceExpression(@NotNull PyReferenceExpression node)