title: Pragmas in python
body: <p>I'm reading bottle.py source code. It's a web framework, with only 3000+ lines python code. So cool.</p>
  
  <p>I found some code like this:</p>
  
  <pre><code>class ServerAdapter(object):
      quiet = False
      def __init__(self, host='127.0.0.1', port=8080, **config):
          self.options = config
          self.host = host
          self.port = int(port)
  
      def run(self, handler): # pragma: no cover
          pass
      ... 
  </code></pre>
  
  <p>What does the <code># pragma: no cover</code> mean? I can't find any introduce about the <code>pragma</code> syntax in the python documentations.</p>