title: Pandas - KeyError: columns not in index
body: <pre><code>import pandas as pd
  import quandl
  
  df=quandl.get('WIKI/GOOGL')
  
  #print(df.head())
  
  df=df[['Adj.Open','Adj.High','Adj.Low','Adj.Close','Adj.Volume']]
  
  df['HL_PCT'] =(df['Adj.High']-df['Adj.Close'])/df['Adj.Close'] * 100
  
  df['PCT_change'] =(df['Adj.Close']-df['Adj.Open'])/df['Adj.Open'] * 100
  
  df=df[['Adj.Close','HT_PCT','PCT_change','Adj.Volume']]
  </code></pre>
  
  <blockquote>
    <p>KeyError: "['Adj.Open' 'Adj.High' 'Adj.Low' 'Adj.Close' 'Adj.Volume'] not in index"</p>
  </blockquote>