title: "Slicing" in Python Expressions documentation
body: <p>I don't understand the following part of the Python docs:</p>
  
  <p><a href="http://docs.python.org/reference/expressions.html#slicings" rel="noreferrer">http://docs.python.org/reference/expressions.html#slicings</a></p>
  
  <p>Is this referring to list slicing ( <code>x=[1,2,3,4]; x[0:2]</code> )..? Particularly the parts referring to ellipsis..</p>
  
  <pre><code>slice_item       ::=  expression | proper_slice | ellipsis
  </code></pre>
  
  <blockquote>
    <p>The conversion of a slice item that is an expression is that expression. The conversion of an ellipsis slice item is the built-in Ellipsis object.</p>
  </blockquote>