title: Is pyc file of build-in modules are also created?
body: <p>Is pyc file of build in modules are also created?</p>
  
  <p>My Scenario:
  I had a file abc.py.</p>
  
  <p>In abc.py, I had imported os modules and the print os.getcwd().</p>
  
  <p>Here, I was expecting os.pyc file must be created, but os.pyc was not created.</p>
  
  <p>Any suggestion please?</p>