title: Type Error: 'builtin_function_or_method' object is not subscriptable
body: <pre><code>for x in values:
      x = header.index["NoExamples*NoFeatures"]
      print (x)
  </code></pre>
  
  <p>when i wrote this codes there is a error second row.</p>
  
  <p><code>"TypeError: 'builtin_function_or_method' object is not subscriptable"</code>. </p>
  
  <p>could you help me about that?</p>