title: Python: No module found even though it exists in directory
body: <p>Consider I have the following project structure:</p>
  
  <pre><code>+PROJECT
  |  +models
  |  |  =__init__.py
  |  |  =client.py
  |  |  =config.py
  |
  |  +tests
  |  | =__init__.py
  |  | =example.py
  |  | =example_two.py
  |
  |  README.md
  |  requirements.txt
  </code></pre>
  
  <p>When I try to import a class from client and a variable from config into example.py, like so:</p>
  
  <pre><code>from models.config import var 
  from models.client import Class
  </code></pre>
  
  <p>I receive a <strong>ModuleNotFound Error</strong> for both import statements. I know this question has been asked plenty of times before but those solutions don't resolve my issue. I tried placing client and config in the same level as the test folder. However, I received the same issue. It would be great If someone can help me work through this issue. </p>