default boolean isOperator(String chars) {
    ASTNode child = getNode().getFirstChildNode();
    StringBuilder buf = new StringBuilder();
    while (child != null) {
      IElementType elType = child.getElementType();
      if (elType instanceof PyElementType && PyElementTypes.BINARY_OPS.contains(elType)) {
        buf.append(child.getText());
      }
      child = child.getTreeNext();
    }
    return buf.toString().equals(chars);
  }
default boolean isOperator(String chars)