title: How do you get double-underscores to display in markdown?
body: <p>In python, there are some special variables and filenames that are surrounded by double-underscores.  For example, there is the</p>
  
  <pre><code>__file__ 
  </code></pre>
  
  <p>variable.  I am only able to get them to show up correctly inside of a code block.  What do I need to enter to get double underscores in regular text without having them interpreted as an emphasis?</p>