title: use Other Dataframe in the condition to get Sub Dataframe
body: <p>Like we can do this :</p>
  <pre><code>df[df['first_name'].notnull() &amp; (df['nationality'] == &quot;USA&quot;)]
  </code></pre>
  <p>I want to get portion of dataframe where the rows obey to 2 conditions that the value of column 'A' and column 'B' from df1 doesn't exist in a row from df2
  I tried :</p>
  <pre><code>df1[~ (df1['A']==df2['A'] &amp; df1['B']==df2['B'])] 
  </code></pre>