Returns or sets (if a value is provided) the chart's height.

        :param height: If given, the chart's height will be set to this.

def height(self, height=None):
        """Returns or sets (if a value is provided) the chart's height.

        :param height: If given, the chart's height will be set to this."""

        if height is None:
            return self._height
        else:
            if not is_numeric(height):
                raise TypeError("height must be numeric, not '%s'" % str(height))
            self._height = height