title: Removing every instance of a duplicate from a dataframe
body: <p>Is there way to remove every instance of duplicates in Pandas?  I don't see an option in <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.drop_duplicates.html" rel="nofollow"><code>drop_duplicates()</code></a>. Is there any way perhaps of getting the indices of the duplicate?</p>