def _instkey(obj):
        '''Wraps an old-style class (instance).
        '''
        i = id(obj)
        k = _instkeys.get(i, None)
        if not k:
            _instkeys[i] = k = _Instkey(obj)
        return k
Wraps an old-style class (instance).
        
recipes/Python/546530_Size_of_Python_objects_revised/recipe-546530.py