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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _onLeftButtonUp(self, evt):
 """End measuring on an axis."""

        x = evt.GetX()
        y = self.figure.bbox.height - evt.GetY()
        #print 'release button', 1
        evt.Skip()
        if self.HasCapture(): self.ReleaseMouse()
        FigureCanvasBase.button_release_event(self, x, y, 1, guiEvent=evt)