def setParent( self, *args, **kwargs ):
        if args and args[-1] is None:
            if not kwargs.get('w', kwargs.get('world', True)):
                raise ValueError('No parent given, but parent to world explicitly set to False')
            if 'world' in kwargs:
                del kwargs['world']
            kwargs['w']=True
        elif 'world' in kwargs:
            # Standardize on 'w', for easier checking later
            kwargs['w'] = kwargs['world']
            del kwargs['world']

        # if you try to parent to the current parent, maya errors...
        # check for this and return if that's the case
        currentParent = self.getParent()
        if ( (currentParent is None and kwargs.get('w', False))
            or (args and currentParent == args[-1]) ):
            return self 
        
        return self.__class__( cmds.parent( self, *args, **kwargs )[0] )
parent
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/core/nodetypes.py/DagNode.setParent