@Nullable
  default PyAstKeywordArgument getKeywordArgument(String name) {
    ASTNode node = getNode().getFirstChildNode();
    while (node != null) {
      if (node.getElementType() == PyElementTypes.KEYWORD_ARGUMENT_EXPRESSION) {
        PyAstKeywordArgument arg = (PyAstKeywordArgument)node.getPsi();
        String keyword = arg.getKeyword();
        if (keyword != null && keyword.equals(name)) return arg;
      }
      node = node.getTreeNext();
    }
    return null;
  }
@Nullable
  default PyAstKeywordArgument getKeywordArgument(String name)