title: Pandas - loc setting column to true even though there is no match?
body: <p>The row</p>
  
  <pre><code>Entry1                               1
  Entry2                               0
  Entry                                Y
  </code></pre>
  
  <p>The <code>Entry</code> I have defined as:</p>
  
  <pre><code>df.loc[(df['Entry1']==1) &amp; (df['Entry2']==1),'Entry'] = 'Y'
  </code></pre>
  
  <p>Am I doing something wrong here?</p>