title: Python ExcelWriter formatting 'all borders'
body: <p>I have this <a href="https://i.stack.imgur.com/jsIVn.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jsIVn.png" alt="enter image description here"></a></p>
  
  <p>I want this</p>
  
  <p><a href="https://i.stack.imgur.com/JN29a.png" rel="noreferrer"><img src="https://i.stack.imgur.com/JN29a.png" alt="enter image description here"></a></p>
  
  <p>I look at the docs but I cannot see a function that would achieve this.</p>