def __setitem__(self, key, value):
        if key in iter(self.keys()):
            dict.__setitem__(self, key, value)
        else:
            raise KeyError(key)
Register to a :class:`~glue.core.data_collection.DataCollection`
dataset/ETHPy150Open ipython/ipython-py3k/IPython/parallel/client/client.py/Metadata.__setitem__--crossover with--dataset/ETHPy150Open glue-viz/glue/glue/core/subset_group.py/SubsetGroup.register