title: Python import troubles
body: <p>This should be simple, but I am struggling. I want one folder for my code and another folder for my tests, to test the code in the working_code folder.</p>
  <pre><code>code/
  │
  ├── working_code/
  │   ├── __init__.py
  │   └── some_code.py
  │
  ├── tests/
  │   ├── __init__.py
  │   └── test_some_code.py
  │
  └── __init__.py
  </code></pre>
  <p>However when I try to import the &quot;some_code&quot; module in the &quot;test_some_code&quot; module:</p>
  <pre><code>import working_code.some_code
  </code></pre>
  <p>It gives an error: ModuleNotFoundError: No module named 'working_code'
  But to my knowledge working_code is a package. What am I missing here?</p>