title: Deleting axvline from the plot
body: <p>Hi :) How can I delete an axvline that was created without assigning it to a variable? When it was assigned to a variable it can be deleted this way:</p>
  <pre><code>line = plt.axvline(x)
  line.remove()
  </code></pre>
  <p>but how can I delete it when it was created like this (without assigning to a variable):</p>
  <pre><code>plt.axvline(x)
  </code></pre>