title: What does the slash mean in help() output?
body: <p>What does the <code>/</code> mean in Python 3.4's <code>help</code> output for <code>range</code> before the closing parenthesis?</p>
  
  <pre><code>&gt;&gt;&gt; help(range)
  Help on class range in module builtins:
  
  class range(object)
   |  range(stop) -&gt; range object
   |  range(start, stop[, step]) -&gt; range object
   |  
   |  Return a virtual sequence of numbers from start to stop by step.
   |  
   |  Methods defined here:
   |  
   |  __contains__(self, key, /)
   |      Return key in self.
   |  
   |  __eq__(self, value, /)
   |      Return self==value.
  
                                          ...
  </code></pre>