title: Select rows for which values are same in select columns Pandas?
body: <p>I'm trying to take the subset of my dataframe that has the same values for an arbitrary amount of columns.</p>
  
  <p>Something like </p>
  
  <pre><code>df[df['col1'] == df['col2'] ==....] 
  </code></pre>
  
  <p>But for an <strong>arbitrary</strong> amount of column names. </p>