title: linking to source code file in sphinx
body: <p>I am documenting a python module in Sphinx. I have a source code file full of examples of the use of my module. I'd like to reference this file. It is too long to inline as continuous code. Is there a way to create a link to the full source file, formatted in a code-friendly way (ie literal or with line numbers)?</p>
  
  <p>Thanks.</p>