# Créé par alexanor, le 07/03/2015 en Python 3.2
from tkinter import *
t=[]
def quitter():
    for i in t:
        i.destroy()
def fen1():
    f1=Tk()
    t.append(f1)
    c1 = Button(f1, text ='OK' )
    c1.pack(side = LEFT, padx = 20, pady = 20)
    f1.mainloop()
def fen2():
    f2=Tk()
    t.append(f2)
    c2 = Button(f2, text ='Nouvelle fenetre', command =fen1 )
    c2.pack(side = LEFT, padx = 20, pady = 20)
    c3 = Button(f2, text ='quitter', command =quitter )
    c3.pack(side = LEFT, padx = 20, pady = 20)
    f2.mainloop()
fen2()