title: Pandas - Creating a New Column
body: <p>I have always made new columns in pandas using the following:</p>
  
  <pre><code>df['new_column'] = value
  </code></pre>
  
  <p>I am using this method, however, am receiving the warning for setting a copy.</p>
  
  <p>What is the way to make a new column without creating a copy?</p>