title: Python packages - import by class, not file
body: <p>Say I have the following file structure:</p>
  
  <pre><code>app/
    app.py
    controllers/
      __init__.py
      project.py
      plugin.py
  </code></pre>
  
  <p>If app/controllers/project.py defines a class Project, app.py would import it like this:</p>
  
  <pre><code>from app.controllers.project import Project
  </code></pre>
  
  <p>I'd like to just be able to do:</p>
  
  <pre><code>from app.controllers import Project
  </code></pre>
  
  <p>How would this be done?</p>