tkinter aktivieren/deaktivieren Menü

Brauche ich etwas Hilfe in diesem.
Ich will, dass die Benutzer zur Anmeldung ...
sobald er angemeldet ist, nur das Menü entsprechend die module, die er zugreifen darf, werden aktiviert.
Ich muss also deaktiviert alle Menüs (außer Datei und Hilfe) in der Anfang..
und ich brauchen, um das entsprechende Menü nach dem login...

den login-code ist noch gar nicht geschrieben.. ich will einfach nur, um zu sehen, wie zu tun, dass...
Mein code ist unten:

import Tkinter as tk

class gv:
    w = 800
    h = 500
    title = 'gsm ...'
    MDLS =   [['File','Settings','_s','Quit'],
            ['main menu','mm1','mm2'],
            ['second menu','sm1','sm2','sm3'],
            ['Help','About']]

class GammaSoft(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master, width=gv.w, height=gv.h)
        self.master.title(gv.title)
        self.master.resizable(0,0)
        self.pack_propagate(0)
        self.pack()

        menu_bar = tk.Menu()
        self.nMenu = []
        mc = 0
        for MDL in gv.MDLS:
            self.nMenu.append(tk.Menu(menu_bar, tearoff=0))
            for itm in MDL[1:]:
                if itm == '_s':
                    self.nMenu[mc].add_separator()
                else:
                    self.nMenu[mc].add_command(label=itm, command=lambda itm=itm: self.menu_call(itm))
            menu_bar.add_cascade(label=MDL[0], menu=self.nMenu[mc])
            mc += 1
        self.master.config(menu=menu_bar)

        frame1 = tk.Frame(self)
        frame1.pack()
        lblUsername = tk.Label(frame1, text='Username: ')
        lblPassword = tk.Label(frame1, text='Password: ')
        lblModule = tk.Label(frame1, text='Module: ')
        lblSpace1 = tk.Label(frame1, text='      ')
        lblSpace2 = tk.Label(frame1, text='      ')
        self.Username_var = tk.StringVar()
        self.txtUsername = tk.Entry(frame1, textvariable=self.Username_var, width=14)
        self.Password_var = tk.StringVar()
        self.txtPassword = tk.Entry(frame1, textvariable=self.Password_var, show="x", width=14)
        self.Module_var = tk.StringVar()
        options = [Li[0] for Li in gv.MDLS[1:len(gv.MDLS)-1]]
        self.Module_var.set(options[0])
        self.cmbModule = tk.OptionMenu(frame1, self.Module_var, *tuple(options))
        self.cmbModule.config(takefocus=1, width=14)
        self.btnLiLo = tk.Button(frame1, text='Log in', command=self.LiLo)

        lblUsername.pack(side=tk.LEFT)
        self.txtUsername.pack(side=tk.LEFT)
        lblSpace1.pack(side=tk.LEFT)
        lblPassword.pack(side=tk.LEFT)
        self.txtPassword.pack(side=tk.LEFT)
        lblSpace2.pack(side=tk.LEFT)
        lblModule.pack(side=tk.LEFT)
        self.cmbModule.pack(side=tk.LEFT)
        self.btnLiLo.pack(side=tk.RIGHT)

        separator = tk.Frame(self,height=2, bd=1, relief=tk.SUNKEN)
        separator.pack(fill=tk.X, padx=5, pady=5)

        frame2 = tk.Frame(self)
        frame2_up = tk.Frame(frame2)
        frame2_up.pack(fill=tk.X, side=tk.TOP)
        frame2_dn = tk.Frame(frame2)
        frame2_dn.pack(fill=tk.BOTH, side=tk.BOTTOM)

        lblFilter = tk.Label(frame2_up, text='Filter Text: ')
        lblAt = tk.Label(frame2_up, text='At: ')
        lblSpace3 = tk.Label(frame2_up, text='      ')
        self.Filter_var = tk.StringVar()
        self.txtFilter = tk.Entry(frame2_up, textvariable=self.Filter_var, width=14)
        self.At_var = tk.StringVar()
        self.cmbAt = tk.OptionMenu(frame2_up, self.At_var, '')
        self.cmbAt.config(takefocus=1, width=14)
        self.btnGo = tk.Button(frame2_up, text='Apply')
        self.btnClr = tk.Button(frame2_up, text='Clear')
        lblFilter.pack(side=tk.LEFT)
        self.txtFilter.pack(side=tk.LEFT)
        lblSpace3.pack(side=tk.LEFT)
        lblAt.pack(side=tk.LEFT)
        self.cmbAt.pack(side=tk.LEFT)
        self.btnClr.pack(side=tk.RIGHT)
        self.btnGo.pack(side=tk.RIGHT)

        frame2.pack(fill=tk.BOTH)
        self.log_out

    def log_out(self):
        pass

    def LiLo(self):
        pass

    def print_out(self):
        print('%s, %s!' % (self.greeting_var.get().title(), self.recipient_var.get()))

    def menu_call(self, data):
        print "Once more, clicked /commanded %s" % data

    def run(self):
        self.mainloop()

app = GammaSoft(tk.Tk())
app.run()