def __getitem__(self, key):
        return tuple(self._mapping[key])
a.__rmul__(b) <==> b*a
dataset/ETHPy150Open tanghaibao/jcvi/utils/grouper.py/Grouper.__getitem__--crossover with--dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/util/arrays.py/MatrixN.__rmul__