title: How do I get a list of all the duplicate items using pandas in python?
body: <p>I have a list of items that likely has some export issues.  I would like to get a list of the duplicate items so I can manually compare them.  When I try to use pandas <a href="http://pandas.pydata.org/pandas-docs/dev/generated/pandas.DataFrame.duplicated.html">duplicated method</a>, it only returns the first duplicate.  Is there a a way to get all of the duplicates and not just the first one?</p>
  
  <p>A small subsection of my dataset looks like this:</p>
  
  <pre><code>ID,ENROLLMENT_DATE,TRAINER_MANAGING,TRAINER_OPERATOR,FIRST_VISIT_DATE
  1536D,12-Feb-12,"06DA1B3-Lebanon NH",,15-Feb-12
  F15D,18-May-12,"06405B2-Lebanon NH",,25-Jul-12
  8096,8-Aug-12,"0643D38-Hanover NH","0643D38-Hanover NH",25-Jun-12
  A036,1-Apr-12,"06CB8CF-Hanover NH","06CB8CF-Hanover NH",9-Aug-12
  8944,19-Feb-12,"06D26AD-Hanover NH",,4-Feb-12
  1004E,8-Jun-12,"06388B2-Lebanon NH",,24-Dec-11
  11795,3-Jul-12,"0649597-White River VT","0649597-White River VT",30-Mar-12
  30D7,11-Nov-12,"06D95A3-Hanover NH","06D95A3-Hanover NH",30-Nov-11
  3AE2,21-Feb-12,"06405B2-Lebanon NH",,26-Oct-12
  B0FE,17-Feb-12,"06D1B9D-Hartland VT",,16-Feb-12
  127A1,11-Dec-11,"064456E-Hanover NH","064456E-Hanover NH",11-Nov-12
  161FF,20-Feb-12,"0643D38-Hanover NH","0643D38-Hanover NH",3-Jul-12
  A036,30-Nov-11,"063B208-Randolph VT","063B208-Randolph VT",
  475B,25-Sep-12,"06D26AD-Hanover NH",,5-Nov-12
  151A3,7-Mar-12,"06388B2-Lebanon NH",,16-Nov-12
  CA62,3-Jan-12,,,
  D31B,18-Dec-11,"06405B2-Lebanon NH",,9-Jan-12
  20F5,8-Jul-12,"0669C50-Randolph VT",,3-Feb-12
  8096,19-Dec-11,"0649597-White River VT","0649597-White River VT",9-Apr-12
  14E48,1-Aug-12,"06D3206-Hanover NH",,
  177F8,20-Aug-12,"063B208-Randolph VT","063B208-Randolph VT",5-May-12
  553E,11-Oct-12,"06D95A3-Hanover NH","06D95A3-Hanover NH",8-Mar-12
  12D5F,18-Jul-12,"0649597-White River VT","0649597-White River VT",2-Nov-12
  C6DC,13-Apr-12,"06388B2-Lebanon NH",,
  11795,27-Feb-12,"0643D38-Hanover NH","0643D38-Hanover NH",19-Jun-12
  17B43,11-Aug-12,,,22-Oct-12
  A036,11-Aug-12,"06D3206-Hanover NH",,19-Jun-12
  </code></pre>
  
  <p>My code looks like this currently:</p>
  
  <pre><code>df_bigdata_duplicates = df_bigdata[df_bigdata.duplicated(cols='ID')]
  </code></pre>
  
  <p>There area a couple duplicate items. But, when I use the above code, I only get the first item.  In the API reference, I see how I can get the last item, but I would like to have all of them so I can visually inspect them to see why I am getting the discrepancy.  So, in this example I would like to get all three A036 entries and both 11795 entries and any other duplicated entries, instead of the just first one.  Any help is most appreciated.</p>