def _unquote_json(quoted_json_document):
    json_document = unquote(quoted_json_document)
    return json.loads(json_document)
get_value(scalar): returns the opacity and color
dataset/ETHPy150Open Yelp/mrjob/mrjob/iam.py/_unquote_json--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/vtk/tf_widget.py/TransferFunction.get_value