title: unique plot marker for each plot in matplotlib
body: <p>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:</p>
  
  <pre><code>for i in xrange(len(y)):
      plt.plot(x, y [i], randomMarker())
  </code></pre>
  
  <p>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.</p>