- [classtree.py](classtree.py) Climb inheritance tree using namespace links, displaying higher superclasses with indentation for height

- [listinstance.py](listinstance.py) Mix-in class that provides a formatted print() or str()

- [listinherited.py](listinherited.py) Mix-in class that provides a formatted print() or str() (Use dir() to collect both instance attr and names inherited from its classes)