Rich Tier

Hi, Great library thanks so much it's really helpful :) I have tree, and I can render the tree via `tree.show(...)` But can I do something like `tree.subtree(ancestors_of=some_node).show()` So it...

Really cool library, thanks :) I have a tree like so: Is there a built in way to collapse the nodes to result in a string like `quantity = Σ(Metered...