title: Can't import pathlib
body: <p>Whenever I write:</p>
  <pre><code>import pathlib 
  </code></pre>
  <p>or</p>
  <pre><code>from pathlib import path 
  </code></pre>
  <p>I got this:</p>
  <pre><code>ImportError: No module named pathlib
  </code></pre>
  <p>I tried also naming it <code>os.path</code>.</p>
  <p>I'm on Python 2.7.14</p>
  <p>Is pathlib in Python 2 or only in 3?
  If it's not available, what else can I use?</p>