title: How to drop dataframe columns using both, a list and not from a list?
body: <p>I am trying to drop pandas column in the following way. I have a list with columns to drop. This list will be used many times in my notebook. I have 2 columns which are only referenced once</p>
  <pre><code>drop_cols=['var1','var2']
  df = df.drop(columns={'var0',drop_cols})
  </code></pre>
  <p>So basically, I want to drop all columns from list drop_cols in addition to a hard-coded &quot;var0&quot; column all in one swoop. This gives an error, How do I resolve?</p>