def __init__(self, width, on, off, color=None):
    self.width = width
    self.on = on
    self.off = off
    self.color = color
Construct a LineStyle.  See class docstring for details on args.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/_internal/graphy/line_chart.py/LineStyle.__init__