def __del__(self):
        print 'Broker is cleaning up after itself.'
        self.tws.disconnect()
default values for value axes
dataset/ETHPy150Open cmorgan/trading-with-python/lib/interactivebrokers.py/Broker.__del__--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/tablib-0.10.0/tablib/packages/openpyxl/chart.py/Axis.default_value