code: def createLine(self, x1, y1, x2, y2, strokewidth=1, stroke="black"):
          
          style_dict = {'stroke-width':strokewidth, 'stroke':stroke}
          myStyle = StyleBuilder(style_dict)
          l = Line(x1, y1, x2, y2)
          l.set_style(myStyle.getStyle())
          return l
docs: Creates a line
          @type  x1: string or int
          @param x1:  starting x-coordinate
          @type  y1: string or int
          @param y1:  starting y-coordinate
          @type  x2: string or int
          @param x2:  ending x-coordinate
          @type  y2: string or int
          @param y2:  ending y-coordinate
          @type  strokewidth: string or int
          @param strokewidth:  width of the pen used to draw
          @type  stroke: string (either css constants like "black" or numerical values like "#FFFFFF")
          @param stroke:  color with which to draw the outer limits
          @return:  a line object