Button refferences in Tkinter class

[Bellum]

I'm rather new to both Tkinter and Classes, so whatever I'm doing wrong probably seems really stupid. Just bare with me, here. The reference to the buttons seems to disappear after the __init__ method, so when I try to call them and change them in another method, I get an attribute error.

    def __init__(self):
        self.window = Tk()
        self.left = Frame(self.window, relief='sunken', border=1)
        self.middle = Frame(self.window, relief='sunken', border=1)
        self.right = Frame(self.window, relief='sunken', border=1)
        self.left.grid(column=0, row=0)
        self.middle.grid(column=2, row=0)
        self.right.grid(column=4, row=0)
 
        self.B1 = Button(self.left, text=' - ', command=self.changeButton(1))
        self.B2 = Button(self.middle, text=' - ', command=self.changeButton(2))
        self.B3 = Button(self.right, text=' - ', command=self.changeButton(3))
        self.B4 = Button(self.left, text=' - ', command=self.changeButton(4))
        self.B5 = Button(self.middle, text=' - ', command=self.changeButton(5))
        self.B6 = Button(self.right, text=' - ', command=self.changeButton(6))
        self.B7 = Button(self.left, text=' - ', command=self.changeButton(7))
        self.B8 = Button(self.middle, text=' - ', command=self.changeButton(8))
        self.B9 = Button(self.right, text=' - ', command=self.changeButton(9))
 
        self.B1.pack()
        self.B2.pack()
        self.B3.pack()
        self.B4.pack()
        self.B5.pack()
        self.B6.pack()
        self.B7.pack()
        self.B8.pack()
        self.B9.pack()
 

One of the methods that raises the AttributeError:

    def gameClear(self):
        self.B1['text'] = ' - '
        self.B2['text'] = ' - '
        self.B3['text'] = ' - '
        self.B4['text'] = ' - '
        self.B5['text'] = ' - '
        self.B6['text'] = ' - '
        self.B7['text'] = ' - '
        self.B8['text'] = ' - '
        self.B9['text'] = ' - '
 

[bartonc]

I prefer to call the config() method of Tkinter objects. Try:

#
def gameClear(self):
        self.B1.config(text=' - ')

[bartonc]

I prefer to call the config() method of Tkinter objects. Try:

#
def gameClear(self):
        self.B1.config(text=' - ')

Here is a discussion on sub-classing and instanciating Tk() and its subordinates.