title: Compare 'name' columns of two different dataframes
body: <pre><code>actual_df['new_col'] = np.where(lookup_df['name'].str.contains(actual_df['name'] + '-'), lookup_df['name'], 'Not Found')
  </code></pre>
  <p>The above code throws the following error:</p>
  <blockquote>
  <p>'Series' objects are mutable, thus they cannot be hashed</p>
  </blockquote>
  <p>How to do the required lookup with another data frame?</p>