sorry that the real piece of code



        self.MplWidget.canvas.axes.set_xlim(left=max(0, self.i-40), right= 
self.i+60)
        self.MplWidget.canvas.axes.plot(x, y,'.k-')
        self.MplWidget.canvas.axes.set_title('pull')
        self.MplWidget.canvas.draw()
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