[Python] How to get() a widget's IntVariable value from the widget?

I am trying to get the value of a Tkinter.Checkbutton's variable using .get(), but I get an error.

import Tkinter as tk

class myApp(tk.Tk):
def __init__(self, parent):
tk.Tk.__init__(self, parent)
self.parent = parent
self.grid()
self.var = tk.IntVar()
self.cb = tk.Checkbutton(self.parent, variable=self.var)
self.cb.bind('<Button-1>', self.useValue)
print self.var.get() # works
print self.cb.get() # does not work
print self.cb.cget('variable') # prints something like PYNUMVAR1
print self.cb.cget('variable').get() # error I mention below
print self.cb.var.get() # error
print self.cb.val.get() # error

def useValue(self, event):
print event.widget.cget('variable').get()) # why not?

if __name__ == '__main__':
runit = myApp(None)
runit.mainloop()


I tried plenty of combinations of everything I've seen all over stackoverflow and other tutorial sites. The error I get is:

AttributeError: '_tkinter.Tcl_Obj' object has no attribute 'get'


It should be an IntVar, not a _tkinter.Tcl_Obj object, which doesn't have a get attribute, when I try, it raises an attribute error on self.var like this:

print self.var.crumpet()


The console lets me know that it is also that type of object. (It did this on my first experiment, but I cannot get it to recreate this error message on the IntVar instance in the example code above, so I think this might be wrong.)

I know I can just use get() on self.var, but if I'm passing the widget to a callback function via the event parameter, I would like to be able to get the value of it.

How can I get the value of the Checkbutton without having to do anything with the variable? Should I avoid assigning it a variable?

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