Tree implementation in python: simple to use for you.
sudo easy_install -U treelib
For installation, APIs and examples, see http://caesar0301.github.io/treelib/
Before version 1.3.0: GPL
After that: Apache
Brett Alistair Kromkamp (brettkromkamp@gmail.com): Basic framework finished.
Xiaming Chen (chenxm35@gmail.com): For reasearch utility, I finish main parts and make the library freely public.
Holger Bast (holgerbast@gmx.de): Replaces list with dict for nodes indexing and improves the performance to a large extend.
Ilya Kuprik (ilya-spy@ynadex.ru): Added ZIGZAG tree-walk mode to function tree_expand()