title: Use pathlib for S3 paths
body: <p>I would like to build some functionality to move files between S3 and my local file system, but <code>pathlib</code> appears to combine repeated slashes, breaking my aws-cli functionality:</p>
  
  <pre><code>&gt;&gt;&gt; from pathlib import Path
  
  &gt;&gt;&gt; str(Path('s3://loc'))
  s3:/loc'
  </code></pre>
  
  <p>How can I manipulate S3 paths in this way?</p>