Read/write boolean specifying whether to use curve smoothing to
        form the line connecting the data points in this series into
        a continuous curve. If |False|, a series of straight line segments
        are used to connect the points.

def smooth(self):
        """
        Read/write boolean specifying whether to use curve smoothing to
        form the line connecting the data points in this series into
        a continuous curve. If |False|, a series of straight line segments
        are used to connect the points.
        """
        smooth = self._element.smooth
        if smooth is None:
            return True
        return smooth.val