title: Attribute Error: 'Workbook' object has no attribute 'active'
body: <p>I am new to both python programming and the raspberry pi environment and I need to do some project with it. As I was trying to run the sample code for the openpyxl library I found myself stuck in the error provided in the title, Attribute Error: 'Workbook' object has no attribute 'active'
  I tried to install some more packages to check if there are just missing libraries but none of them work</p>
  
  <p>the code I am trying is below:</p>
  
  <pre><code>    from openpyxl import Workbook
      wb = Workbook()
      ws = wb.active
      ws['A1'] = 42
      ws.append([1, 2, 3])
      import datetime
      ws['A2'] = datetime.datetime.now()
      wb.save("sample.xlsx")
  </code></pre>
  
  <p>how can I get to run it? thanks in advance</p>