title: Pandas DataFrame Retrieve Value from Column
body: <p>Supposely I have dataframe as below:</p>
  
  <pre><code>Idx A B C
  0   1 2 3
  1   3 4 5
  2   2 3 8
  </code></pre>
  
  <p>The max value of dataframe column B is 4, and I could get the index from <code>df["B"].argmax()</code> which is 1.</p>
  
  <p>The problem is now, how could I get the exact max value of the dataframe column B?</p>
  
  <p>Thanks!</p>