from Tkinter import *
from ttk import *

def button(master, txt, line, col):
    new = Button(master, text=txt)
    new.grid(row=line, column =col, columnspan=2)

def frame(nb, txt):
    f = Frame(nb)
    nb.add(f, text = txt)

root = Tk()
nb = Notebook(root)
f1 = frame(nb, '1')
f2 = frame(nb, '2')

button(f1, '1', 0, 0)
nb.grid()
root.mainloop()