title: Creating labels where line appears in matplotlib figure
body: <p>I have a figure created in matplotlib (time-series data) over which are a series of </p>
  
  <pre><code>matplotlib.pyplot.axvline
  </code></pre>
  
  <p>lines. I would like to create labels on the plot that appear close to (probably on the RHS of the line and towards the top of the figure) these vertical lines.</p>