def default(self, o):
        raise TypeError(repr(o) + " is not JSON serializable")
createTreeWidget() -> QSearchTreeWidget
dataset/ETHPy150Open deanhiller/databus/webapp/play1.3.x/python/Lib/json/encoder.py/JSONEncoder.default--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/common_widgets.py/QSearchTreeWindow.createTreeWidget