"""
classtree.py: Climb inheritance trees using namespace links,
displaying higher superclasses with indentation for height
"""

def classtree(cls, indent):
    print('.' * indent + cls.__name__)     # Print class name here
    for supercls in cls.__bases__:         # Recur to all superclasses
        classtree(supercls, indent+3)      # May visit super > once

def instancetree(inst):
    print('Tree of', inst)                 # Show instance
    classtree(inst.__class__, 3)           # Climb to its class

def selftest():
    class A:      pass
    class B(A):   pass
    class C(A):   pass
    class D(B,C): pass
    class E:      pass
    class F(D,E): pass
    instancetree(B())
    instancetree(F())

if __name__ == '__main__': selftest()