def addch(self, nch=1):
        """
        Creates a channel object (curve)
        nch is the number of channels.
        """
        col = [color.white,color.blue,color.red,color.green,color.yellow,color.cyan,color.magenta, color.orange]
        tplch = tuple([curve(radius=0, color=col[n%len(col)])for n in xrange(nch)])

        return tplch

        Creates a channel object (curve)
        nch is the number of channels.
        
recipes/Python/413432_Stripchart_Plotter/recipe-413432.py