title: Copy Pandas DataFrame using '=' trick
body: <p>I have two pandas DataFrames, <code>sdm</code>. I wanted to create a copy of that DataFrame and work on that and later, I want to create another copy from <code>sdm</code> and work on different analysis. However, when I create a new Data Frame like this,</p>
  
  <pre><code>new_df = sdm
  </code></pre>
  
  <p>It creates a copy, however, when I alter <code>new_df</code>, it makes changes to the my old DataFrame <code>sdm</code>. How can I handle this without using <code>=</code>?</p>