title: Get number of sheet excel in python
body: <p>How get number of sheet in below python example?</p>
  
  <pre><code>file = self.excel_file.decode('base64')
  
  excel_fileobj = TemporaryFile('wb+')
  excel_fileobj.write(file)
  excel_fileobj.seek(0)
  
  workbook = openpyxl.load_workbook(excel_fileobj, data_only=True)
  
  sheet_number= ???
  
  sheet = workbook[workbook.get_sheet_names()[0]]
  
  
  for row in sheet.rows:
              print(row[1].value)
  </code></pre>
  
  <p>sheet_number=????</p>
  
  <p>Any solutin?</p>