lit">'b'</span>-&gt;<span class="num">3</span>, <span class="lit">'c'</span>-&gt;<span class="num">4</span>)</pre><p>The method <code>raw</code> accesses the value directly, which may reveal the underlying representation
of a missing value (so be careful).</p><pre>s.raw(<span class="num">0</span>) == <span class="num">1</span></pre><p><code>Series</code> may be used in arithmetic expressions which operate on two <code>Series</code> or on a
<code>Series</code> and a scalar value. In the former case, the two 