title: Tkinter: how to fix the window opening position while letting the width and height wrap the content
body: <p>I want to my <code>Tkinter</code> window to open at the center of the screen while not having to enter the width and height of the screen myself.
  I have gone through <a href="https://stackoverflow.com/a/14910894/3551661">this</a> great answer but it requires specifying the dimensions of the window.</p>
  
  <p>Instead of this
  <a href="https://i.stack.imgur.com/2yQvO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2yQvO.png" alt="enter image description here"></a></p>
  
  <p>I want to get a result like this:
  <a href="https://i.stack.imgur.com/a6jBk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/a6jBk.png" alt="enter image description here"></a></p>