title: Pandas How to Print a Certain Column
body: <p>I have a dataframe that looks like this:</p>
  <pre><code>     security_group    test     test_2   test_3
  0          group a       1        Jon    blue
  1          group b       2        bob    green
  </code></pre>
  <p>I want to print (not delete from the dataframe, just simply print. I don't want to actually modify the dataframe) 1 of the columns. For example:</p>
  <pre><code>      test_3
  0       blue
  1      green
  </code></pre>
  <p>I tried doing the following:</p>
  <pre><code>print(df([test_3]))
  </code></pre>
  <blockquote>
  <p>This generates the following error message: NameError: name &quot;test_3&quot;
  is not defined</p>
  </blockquote>
  <p>Any suggestions?</p>