title: Which arguments is 'FutureWarning: Use of **kwargs is deprecated, use engine_kwargs instead' refering to?
body: <p>I got the following waring from that code:</p>
  <pre><code>    file = r'.\changed_activities.xlsx'
      with pd.ExcelWriter(file,
                          engine='openpyxl',
                          mode='a',
                          if_sheet_exists='new') as writer:
          df.to_excel(writer, sheet_name=activity[0:30])
  
  
  FutureWarning: Use of **kwargs is deprecated, use engine_kwargs instead. with pd.ExcelWriter(file,
  </code></pre>
  <p>What I can't seem to read from the <a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.ExcelWriter.html#pandas.ExcelWriter" rel="nofollow noreferrer">documentation</a> is which of my arguments I need to replace?
  the examples are e.g. this, but I don't see how that translates to my code.</p>
  <pre><code>with pd.ExcelWriter(
      &quot;path_to_file.xlsx&quot;,
      engine=&quot;openpyxl&quot;,
      mode=&quot;a&quot;,
      engine_kwargs={&quot;keep_vba&quot;: True}
  ) as writer:
      df.to_excel(writer, sheet_name=&quot;Sheet2&quot;) 
  </code></pre>
  <p>And maybe in a more open question: how/where can I understand something like that that in a general case?</p>