Problem Statement

What is the output of the following Python code? Code class ListTree: def __attrnames(self, obj, indent): spaces = ' ' * (indent + 1) result = "" for attr in sorted(obj.__dict__): if attr.startswith('__') and attr.endswith('__'): result += spaces + '{0}={1}\n'.format(attr, getattr(obj, attr)) return result def __listclass(self, aClass, indent): dots = '.' * indent if aClass in self.__visited: return '\n{0}<Class {1}:, address {2}: (see above)>\n'.format( dots, aClass.__name__, id(aClass)) else: self.__visited[aClass] = True here = self.__attrnames(aClass, indent) above = '' for super in aClass.__bases__: above += self.__listclass(super, indent + 4) return '\n{0}<Class {1},address {2}:\n{3}{4}{5}>\n'.format( dots, aClass.__name__, id(aClass), here, above, dots) def __str__(self): self.__visited = {} here = self.__attrnames(self, 0) above = self.__listclass(self.__class__, 4) return '<Instance of {0},address {1}:\n{2}{3}>'.format( self.__class__.__name__, id(self), here