Traceback (most recent call last):
  File "/Users/loic/cat_loic/python/catculapy.py/catculapy.py", line 70, in <module>
    app = Application()
  File "/Users/loic/cat_loic/python/catculapy.py/catculapy.py", line 45, in __init__
    self.mBar = MenuBarre()
NameError: global name 'MenuBarre' is not defined

# -*- coding: utf-8 -*-

#nom : catculapy.py, calculatrice en Python ( mode fênetre ) version 1.0.0
#Copyright (C) 2007  Loïc Chardonnet

#This program is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2 of the License, or
#(at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program; see the file COPYING. If not, write to the
#Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

from Tkinter import *
from math import *

# Modules
class MenuBare(Frame):
    "Barre de menu déroulant"
    def __init__(self, boss=None):
        "Fonction d'initialisation"
        Frame.__init__(self, borderwidth=2)

        # 1 ) Menu "catculapy"
        fileMenu = Menubutton(self, text='catculapy')
        fileMenu.pack(side=LEFT)
        # 1.1 ) Partie déroulante :
        me1.add_command(label='Quitter', underline=0, command=boss.quit)
        # 1.2 ) Intégration du menu :
        fileMenu.configure(menu =me1)

class Application():
    "Application principale"
    def __init__(self, boss=None):
        "Fonction d'initialisation"
        self.root = Tk()
        self.root.geometry('250x50')
        self.root.title('catculapy, la calculatrice !')
        self.mBar = MenuBarre()
        self.mBar.pack()
        self.can = Canvas(self.root, borderwidth=2)
        self.can.pack()
        self.chaine = Label(self.can)
        self.chaine.pack(side=BOTTOM)
        self.entree = Entry(self.can)
        self.entree.bind("<Return>", self.calculer)
        self.entree.pack()
        self.root.mainloop()

    def calculer(self, event):
        "Fonction qui calcule ce que l'utilisateur à entré"
        global test, resultat
        test = self.entree.get()
        if test == "":     
            resultat = 0

        else:
            resultat = str(eval(self.entree.get()))

        self.chaine.configure(text="Résultat = " + str(resultat))

# Programme principal
if __name__ == '__main__':
    app = Application()

NameError: global name 'MenuBarre' is not defined

class MenuBare