title: how to join (A∩B') using left join in python?
body: <p>I want to df1 ∩ df2'   in a pandas dataframe</p>
  
  <p>df1 has headers (given below) with 100 rows</p>
  
  <pre><code>  {a , b, c , d,x,y,v }
  </code></pre>
  
  <p>df2 has headers (given below) with 100 rows</p>
  
  <pre><code>{a, b, e, f,p,o,i}
  </code></pre>
  
  <p>the output of the join (just using the header names )</p>
  
  <pre><code>{c , d,x,y,v }
  </code></pre>