def __init__(self):
        self.pipelined_args = []
        self.number_of_stacked_calls = 0
iterator doing a postorder expansion of args
dataset/ETHPy150Open thefab/tornadis/tornadis/pipeline.py/Pipeline.__init__--crossover with--dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/util/arguments.py/postorder