Hi, I am about to start a quick review about the docstrings...
My first recommendation would be to have a look at [PEP-257] (http://legacy.python.org/dev/peps/pep-0257/) and [reStructuredText syntax] (http://docutils.sourceforge.net/rst.html#user-documentation).

In this first line of the module, you could replace `"""` by `"""treelib - Simple to use for you.` (and remove line 4 below).