title: How to remove a subset of a data frame in Python?
body: <p>My dataframe df is 3020x4.
  I'd like to remove a subset df1 20x4 out of the original. In other words, I just want to get the difference whose shape is 3000x4. I tried the below but it did not work. It returned exactly df. Would you please help? Thanks.</p>
  
  <pre><code>new_df = df.drop(df1)
  </code></pre>