title: Python's pathlib get parent's relative path
body: <p>Consider the following <code>Path</code>:</p>
  <pre><code>import pathlib
  path = pathlib.Path(r'C:\users\user1\documents\importantdocuments')
  </code></pre>
  <p>How can I extract the exact string <code>documents\importantdocuments</code> from that <code>Path</code>?</p>
  <p>I know this example looks silly, the real context here is translating a local file to a remote download link.</p>