@Override
    public void visitPyParenthesizedExpression(final @NotNull PyParenthesizedExpression expression) {
      final Stack<PsiElement> stack = new Stack<>();
      stack.push(expression);
      while (!stack.isEmpty()) {
        PsiElement element = stack.pop();
        if (!(element instanceof PyTupleExpression)) {
          findProblem(element);
          if (element != null) {
            for (PsiElement psiElement : element.getChildren()) {
              stack.push(psiElement);
            }
          }
        }
      }
    }
@Override
    public void visitPyParenthesizedExpression(final @NotNull PyParenthesizedExpression expression)