title: error 'method' object is not subscriptable
body: <p>I am getting the error  'method' object is not subscriptable . Please tell me about this error ? and what is the problem in my code ?</p>
  
  <pre><code>def answer_five():
      census = census_df.copy()
      census.set_index['STNAME]
      return (census['COUNTY']).argmax()
  answer_five()
  </code></pre>