title: how to highlight the radio buttons one after the other in following code
body: <p>How to highlight the radio buttons one after the other in following code?</p>
  
  <p>The following code is in working condition but we are not able to highlight button automatically (scanning):</p>
  
  <pre><code>import tkinter as tk
  
  root = tk.Tk()
  v = tk.IntVar()
  v.set(1)  # initializing the choice, i.e. a
  
  languages = [
      ("a",1),
      ("b",2),
      ("c",3),
      ("d",4),
      ("e",5)
  ]
  
  def ShowChoice():
      print(v.get())
  
  tk.Label(root, 
           text="""Choose your favourite 
  programming language:""",
           justify = tk.LEFT,
           padx = 36).pack()
  
  for val, language in enumerate(languages):
      tk.Radiobutton(root, 
                    text=language,
                    padx = 20, 
                    variable=v, 
                    command=ShowChoice,
                    value=val).pack(anchor=tk.W)
  
  
  root.mainloop()
  </code></pre>
  
  <p>Screenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/yOJ2s.png" alt="Screenshot"></p>