unique plot marker for each plot

I have a loop where i create some plots and I need unique marker for each plot. I think about creating function, which returns random symbol, and use it in my program in this way:

for i in xrange(len(y)):
    plt.plot(x, y [i], randomMarker())

but I think this way is not good one. I need this just to distinguish plots on legend, because plots must be not connected with lines, they must be just sets of dots.