title: Scrolling through multiple listboxes using one scrollbar without using a class
body: <p>I would like to use a single (vertical) scrollbar to scroll through multiple listboxes at the same time (synchronised) in Tkinter. </p>
  
  <p>The problem is that all the solutions out there on Stack Overflow seem to use classes to append a single scrollbar to multiple listboxes. I would like to do the same without using a class if that's possible as I haven't got any experience with classes.</p>
  
  <p>Here's a simplified version of my code:</p>
  
  <pre><code>from tkinter import *
  import tkinter as tk
  
  
  root = Tk()
  
  ##This code will only scroll through 1 listbox.
  listbox1 = Listbox(root)
  listbox1.grid(row=1, column=2)
  listbox2 = Listbox(root)
  listbox2.grid(row=1, column=3)
  scrollbary = Scrollbar(root, command=listbox1.yview, orient=VERTICAL)
  scrollbary.grid(row=1, column=1, sticky="ns")
  
  for i in range(100):
      listbox1.insert("end","item %s" % i)
      listbox2.insert("end","item %s" % i)
  </code></pre>