title: How do I import a Python script from a sibling directory?
body: <p>Let's say I have the following directory structure:</p>
  <pre class="lang-none prettyprint-override"><code>parent_dir/
      foo_dir/
          foo.py
      bar_dir/
          bar.py
  </code></pre>
  <p>If I wanted to import <code>bar.py</code> from within <code>foo.py</code>, how would I do that?</p>