title: pandas: How to work with _iLocIndexer?
body: <pre><code>&gt;&gt;&gt; import pandas as pd
  &gt;&gt;&gt; pd.__version__
  '0.16.1'
  &gt;&gt;&gt; s1 = pd.Series([1, 3, 5], index=list('abc'))
  &gt;&gt;&gt; s1.iloc(0)
  &lt;pandas.core.indexing._iLocIndexer object at 0x10ca3f690&gt;
  </code></pre>
  
  <p>I expected the integer 1 to be returned for <code>s1.iloc(0)</code>, but got an <code>_iLocIndexer</code> object instead.  What can I do with this object?  How do I work with it?</p>