title: Pandas Conditional Drop
body: <p>I'm trying to conditionally drop rows out of a pandas dataframe, using syntax as such:</p>
  
  <pre><code>if ((df['Column_1'] == 'value_1') &amp; (df['Column_2'] == 'value_2')):
      df['Columns_3'] == df['Column_4']
  else:
      df.drop()
  </code></pre>
  
  <p>Thanks in advance for the help. </p>