title: Return fiscal quarter from dataframe date column with custom string in Python
body: <pre><code>    quarter = pd.Timestamp(dt.date(2020, 1, 1)).quarter
      assert quarter == 1
  
      df['quarter'] = df['date'].dt.quarter
  </code></pre>
  <p>This returns a 1,2,3 or 4 in df['quarter'] depending on the date in column df['date'].</p>
  <p>What I would like to have is this format in column df['quarter']:</p>
  <p>Qx-2019 or Qx-2020 depending on the year, where x is the quarter found with the script above.</p>
  <p>How can I get the specific year from the quarter and add the formt Qx-year?</p>
  <p>Thank you.</p>