def sum(self, *args, **kwargs):
        return sum(self, start=kwargs.get('start', 0), axis=kwargs.get('axis', args))
a.sum([axis0[, axis1[, ...[, start=0]]]]) <=> sum(a, start=start, axis=(axis0, axis1, ...))
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/util/arrays.py/Array.sum