message: remove string from variable name, since it may be a tuple
diff: @@ -37,12 +37,12 @@ class MPViewer(BaseViewer):
  marker='x')
  def drawLine2d(self, line2d, color='blue', alpha=1.0, dashed=False, zorder=1, linewidth=1):
  - linestyle_string = (0, (5, 10)) if dashed else 'solid'
  + linestyle = (0, (5, 10)) if dashed else 'solid'
  line2d_np = line2d.ToArray()
  self.axes.plot(
  line2d_np[:, 0],
  line2d_np[:, 1],
  - linestyle=linestyle_string,
  + linestyle=linestyle,
  color=self.getColor(color),
  alpha=alpha,
  zorder=zorder,
  