title: Matplotlib transparent line plots
body: <p>I am plotting two similar trajectories in matplotlib and I'd like to plot each of the lines with partial transparency so that the red (plotted second) doesn't obscure the blue.</p>
  
  <p><img src="https://i.stack.imgur.com/O3V1B.png" alt="alt text"></p>
  
  <p><strong>EDIT</strong>: Here's the image with transparent lines.</p>
  
  <p><img src="https://i.stack.imgur.com/D3GaU.png" alt="alt text"></p>