title: Twinx/Secondary-y: Do not start with first color
body: <p>I have a color scheme that comes from </p>
  
  <pre><code>plt.style.use('ggplot')
  </code></pre>
  
  <p>so <strong>I don't want to manually pick colors, or pick them from a color cycler</strong>. However, when I have a secondary axis:</p>
  
  <pre><code>fig, ax = plt.subplots()
  ax2 = ax.twinx()
  ax.plot(np.array([1, 2]))
  ax2.plot(np.array([3, 4]))
  </code></pre>
  
  <p>It will plot both lines in the same color. How do I tell <code>ax2</code> that there is already <code>n=1</code> lines drawn on that plot, such that it starts with the <code>n+1</code>th color?</p>