title: If then else Python
body: <p>If I have the following dataset how can I create a new field called <code>Article_Title</code> that will use this logic:</p>
  <p>if the title is not <code>NaN</code> then copy the contents into <code>Article_Title</code>
  else if <code>thread_title</code> is not <code>NaN</code> then copy the contents into <code>Article_Title</code></p>
  <p><a href="https://i.stack.imgur.com/xfWlI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xfWlI.png" alt="Screenshot of table" /></a></p>