new_contents: # View more python learning tutorial on my Youtube and Youku channel!!!
  
  # Youtube video tutorial: https://www.youtube.com/channel/UCdyjiB5H8Pu7aDTNVXTTpcg
  # Youku video tutorial: http://i.youku.com/pythontutorial
  
  import tkinter as tk
  
  window = tk.Tk()
  window.title('my window')
  window.geometry('200x200')
  
  var = tk.StringVar()
  l = tk.Label(window, bg='yellow', width=20, text='empty')
  l.pack()
  
  def print_selection():
      l.config(text='you have selected ' + var.get())
  
  r1 = tk.Radiobutton(window, text='Option A',
                      variable=var, value='A',
                      command=print_selection)
  r1.pack()
  r2 = tk.Radiobutton(window, text='Option B',
                      variable=var, value='B',
                      command=print_selection)
  r2.pack()
  r3 = tk.Radiobutton(window, text='Option C',
                      variable=var, value='C',
                      command=print_selection)
  r3.pack()
  
  
  window.mainloop()
  
subject: create tk5