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Tkinter menu checkbutton not working

Dodo dodo_do_not_wake_up at yahoo.Fr
Wed Jun 9 13:20:46 EDT 2010 
Le 09/06/2010 18:54, rantingrick a écrit :
> On Jun 9, 11:26 am, Dodo<dodo_do_not_wake... at yahoo.Fr>  wrote:
>> Hello,
>>
>> I trying to make this piece of code work (this is python3)
>>
>> from tkinter import *
>> from tkinter.ttk import *
>>
>> class Window:
>>    def __init__(self):
>>     self.root = Tk()
>>
>>     self.menu = Menu(self.root)
>>     self.root['menu'] = self.menu
>>
>>     self.submenu = Menu(self.menu)
>>     self.ck = 0
>>     self.submenu.add_checkbutton(label="My checkbutton",
>> variable=self.ck, command=self.displayCK)
>>     self.menu.add_cascade(label="sub", menu=self.submenu )
>>
>>    def displayCK(self):
>>     print( self.ck )
>>
>> app = Window()
>> app.root.mainloop()
>
>
> see my recent post on your last question. The way you are writing
> these classes is wrong. Always inherit from something, in this case
> Tk. Fix that first and then pretty up this GUI. But to answer your
> question "self.ck" needs to be an instance of tk.IntVar. Read more
> about it here...
>
>      http://infohost.nmt.edu/tcc/help/pubs/tkinter/checkbutton.html

I already tried with self.ck = IntVar()
and now it displays PY_VAR0

FYI, I'm using Thunderbird 3, which appears to have some bugs with 
indentation (according to Alf P. Steinbach). That's why I replaced \t by 
a single space
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