title: dropping columns from dataframes
body: <p>I have 5 dataframes and I want to drop certain columns from them. I tried for loop, something like this -</p>
  
  <pre><code>dataframes =[af,bf,cf,df,ef,ff,gf]
  for col in dataframes:
    print col.head(1)
    col = col.drop(col.columns[[0,2]],axis=1)
    print col.head(1)
  </code></pre>
  
  <p>I know the approach is wrong. How to do that without doing it repetitively ?</p>