title: What is the name of this operator “ _ ” in Python?
body: <p>I was reading <a href="https://stackoverflow.com/questions/101268/hidden-features-of-python?page=5&amp;tab=oldest#tab-top">Hidden features of Python</a> and I came across this <a href="https://stackoverflow.com/a/3254039/1031955">answer</a>. </p>
  
  <p>Right from the post:</p>
  
  <blockquote>
    <p>When using the interactive shell, "_" contains the value of the last
    printed item:</p>
  </blockquote>
  
  <pre><code>&gt;&gt;&gt; range(10)
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  &gt;&gt;&gt; _
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  &gt;&gt;&gt;
  </code></pre>
  
  <p><strong>What is the name of this operator ?</strong> I cannot find it on the document and I've never heard of it (as well as in other languages). Is it worth using it?</p>
  
  <p><em>PS. I want to know its name because I want to see how the function is implemented and to search if other languages have this awesome function.</em></p>