from tkinter import *

window = Tk()

window.title("Welcome to Tkinter!")
window.geometry('400x300+30+200')

def select():
    print(selectedNdx.get())
    lbl.configure(text = "You selected:  " + str(selectedNdx.get()) )

selectedNdx = IntVar()
rad1 = Radiobutton(window,text='First',  value=1, variable=selectedNdx, command = select)
rad2 = Radiobutton(window,text='Second', value=2, variable=selectedNdx, command = select)
rad3 = Radiobutton(window,text='Third',  value=3, variable=selectedNdx, command = select)

rad1.grid(column=0, row=0)
rad2.grid(column=0, row=1)
rad3.grid(column=0, row=2)



# One label is a pure entry box description
lbl = Label(window, text="You selected:  " )
lbl.grid(column=0, row=3)




window.mainloop()