title: How to identify Pandas' backend for Parquet
body: <p>I understand that Pandas can read and write to and from Parquet files using different backends: <code>pyarrow</code> and <code>fastparquet</code>.</p>
  
  <p>I have a Conda distribution with the Intel distribution and "it works": I can use <code>pandas.DataFrame.to_parquet</code>. However I do not have <code>pyarrow</code> installed so I guess that <code>fastparquet</code> is used (which I cannot find either).</p>
  
  <p>Is there a way to identify which backend is used?</p>