title: What do the python file extensions, .pyc .pyd .pyo stand for?
body: <p>What do these python file extensions mean?</p>
  
  <ul>
  <li>.pyc</li>
  <li>.pyd</li>
  <li>.pyo</li>
  </ul>
  
  <p>What are the differences between them and how are they generated from a *.py file?</p>