class matplotlib.collections.LineCollection(segments, linewidths=None, colors=None, antialiaseds=None, linestyles='solid', offsets=None, transOffset=None, norm=None, cmap=None, pickradius=5, zorder=2, facecolors='none', **kwargs)
作为一个类，LineCollection继承自matplotlib.collections.Collection。
LineCollection实现再图形中绘制多条线。