hwscan3 IMS: TCC processor inventory report

This class implements the logic of the Singleton design pattern. It is cribbed directly from Guido van Rossum's document, Unifying types and classes in Python 2.2.

# - - - - -   c l a s s   S i n g l e t o n

class Singleton(object):

    def __new__(cls, *args, **kwds):
        it  =  cls.__dict__.get('__it__')
        if it is not None:
            return it
        cls.__it__  =  it  =  object.__new__(cls)
        it.init(*args, **kwds)
        return it

    def init(self, *args, **kwds):
        pass

Inheriting classes should override method init(), not __init__.