A Python class-tree climber

lister.py

#!/usr/share/python
class ListInstance:
    def __str__(self):
        return '<Instance of %s, address %s:\n%s>' % (
                self.__class__.__name__,
                id(self),
                self.__attrnames())

    def __attrnames(self):
        result = ''
        for attr in dir(self):
            if attr[:2] == '__' and attr[-2:] == '__':
                result += '\tname %s=<>\n' % attr
            else:
                result += '\tname %s=%s\n' % (attr, getattr(self, attr))
        return result


class Super:
    def __init__(self):
        self.data1 = 'spam'

    def hem(self):
        pass


class Sub(Super, ListInstance):
    def __init__(self):
        Super.__init__(self)
        self.data2 = 'eggs'
        self.data3 = 42

    def spam():
        pass

if __name__ == '__main__':
    X = Sub()
    print(X)