How to create a radio button? What is the mistake here?

Question

from tkinter import *
root = Tk()
var = IntVar()
var.set(1)
rad0 = Radiobutton(root,text="Первая",variable=var,value=0)
rad1 = Radiobutton(root,text="Вторая",variable=var,value=1)
rad2 = Radiobutton(root,text="Третья",variable=var,value=2)
var.pack()
root.mainloop()

Answer 1

from Tkinter import *
....
rad0 = Radiobutton(root, text="btn1", variable=var, value=1)
rad0.pack.(anchor=W)
......

label = Label(root)
label.pack()
root.mainloop()

Answer 2

u need to call .pack() with each radiobutton variable ,and at end need to create label and call pack() otherwise it will show attribute error if try to pack using var(IntVar)