Module tools
The tools module is the placeholder for classes that give access to
the Composite tools, i.e. the controller (the intelligence) behind a tool
node.
Nodes for which the tool controller is exposed in Python have an
"ext" attribute (for "extension") which provides
methods to invoke the tool's higher functionality, similar to what is
offered in the tool's graphical user interface.
This module is not really meant to be imported directly in user
scripts and is pretty much empty if imported on its own prior to
accessing tool nodes because the tool classes get injected in this module
on demand, that is, when an instance of the tool node is accessed or
created through Python.