def __init__(self, column, colour1, colour2):
        self.column = column
        self.colour1 = colour1
        self.colour2 = colour2
        self.categorical = False
decorator to wrap function in a wx.CallAfter() so that
dataset/ETHPy150Open pydata/pandas/pandas/tools/rplot.py/ScaleGradient.__init__--crossover with--dataset/ETHPy150Open xraypy/xraylarch/plugins/wx/gui_utils.py/SafeWxCall