Question

I was trying to add a progress bar to my Tkinter gui, and I have been stymied by a problem that I am not 100% sure how to define. My program is setup in this fassion.

class MAIN(object):
    def __init__(self, *args, **kwargs)
        tkinter stuff...

root = tk.Tk()
app = MAIN(root)
app.mainloop()

And then I tried to add a progress using this example (that works on its own). And this code is set up like this.

class MAIN(tk.Tk):
    def __init__(self, *args, **kwargs)
        tk.Tk.__init(self, *args, **kwargs)
        tkinter stuff....

app = MAIN()
app.mainloop()

If I change either of these programs to have the other’s format they throw errors. I would ideally like to be able to keep my format (the first one) and be able to run the example in my format, so that way I don’t have to update a lot of legacy code.

Help/explanations will be greatly appreciated.

Edit: Here is the error.

TypeError: unbound method __init__() must be called with Tk instance as first argument (got SampleApp instance instead)

Answer 1

My issue was that I did not understand inheritance in classes, and where as my program prior to trying to use the progress bar did not need any modifications to the tk.Tk.__init__. So the resolution to the issue was to replace the class MAIN(object): with class MAIN(tk.Tk): as in the working example. My progress bar still does not work right and now there is another window, but the program runs.