Tkinter Radio button Dynamic select

Question

I created a simple program with 2 radio buttons, Option-1 and Option-2 respectively.

By default, Option-1 is selected and the label "You selected Option 1" is displayed.

During the runtime, if the user selects Option-2, then the label "You selected Option 2" should be displayed.

With this requirement, I created the program below. But is not working. There is no response after I select Option-2 radio button.

My code is given below.
Can any of you solve my issue ?

import tkinter as tk

class window1:

 def __init__(self, master):
    self.master = master
    self.frame1 = tk.Frame(self.master, width=300, height=100)
    self.frame1.place(x=5, y=5)
    window1.priority = tk.IntVar(value=1)

 def message_radio(self):

    if self.priority.get() == 1:
        Message1 = tk.Label(self.frame1, text="You selected Option 1").place(x=10, y=35)
    else:
       Message2 = tk.Label(self.frame1, text="You selected Option 2").place(x=10, y=35)

 def radio_button(self):
    radiobutton1 = tk.Radiobutton(self.frame1, text="Option 1", variable=self.priority, 
    value=1,command=window1.message_radio(self))
    radiobutton1.place(x=10, y=10)

    radiobutton2 = tk.Radiobutton(self.frame1, text="Option 2", variable=self.priority, 
    value=2,command=window1.message_radio(self))
    radiobutton2.place(x=175, y=10) def main():
def main():   
  root = tk.Tk()
  root.geometry( "300x100" )
  app = window1( root )
  app.radio_button()
  root.mainloop()

if __name__ == '__main__':
 main()