def add(
        self,
        label: RenderableType,
        *,
        style: Optional[StyleType] = None,
        guide_style: Optional[StyleType] = None,
        expanded: bool = True,
        highlight: Optional[bool] = False,
    ) -> "Tree":
        """Add a child tree.

        Args:
            label (RenderableType): The renderable or str for the tree label.
            style (StyleType, optional): Style of this tree. Defaults to "tree".
            guide_style (StyleType, optional): Style of the guide lines. Defaults to "tree.line".
            expanded (bool, optional): Also display children. Defaults to True.
            highlight (Optional[bool], optional): Highlight renderable (if str). Defaults to False.

        Returns:
            Tree: A new child Tree, which may be further modified.
        """
        node = Tree(
            label,
            style=self.style if style is None else style,
            guide_style=self.guide_style if guide_style is None else guide_style,
            expanded=expanded,
            highlight=self.highlight if highlight is None else highlight,
        )
        self.children.append(node)
        return node
Add a child tree.

        Args:
            label (RenderableType): The renderable or str for the tree label.
            style (StyleType, optional): Style of this tree. Defaults to "tree".
            guide_style (StyleType, optional): Style of the guide lines. Defaults to "tree.line".
            expanded (bool, optional): Also display children. Defaults to True.
            highlight (Optional[bool], optional): Highlight renderable (if str). Defaults to False.

        Returns:
            Tree: A new child Tree, which may be further modified.
        
rich/tree.py