populating tkinter combobox from function

[Ian_7]

Hi all,

Have my below program:

from tkinter import *
from tkinter import ttk
from tkinter import messagebox

class Application(object):
    def __init__(self, master):
        self.master = master

        qPlacement = IntVar()

        self.cc = ttk.Combobox(self.master, textvariable=qPlacement, width = 5).place(x = 5, y = 30)

        Button(self.master, text = 'Click Me', command = self.popCombo).place(x = 5, y = 60)

    def popCombo(self):
        print('Inside function')
        val = []
        min = 0
        max = 10

        while min <= max:
            val.append(min)
            min += 1

        self.cc['values'] = val

def main():
    root = Tk()
    app = Application(root)
    root.title("Test App")
    root.geometry('200x200')
    root.resizable(False, False)
    root.mainloop()

if __name__ == '__main__':
    main()

Such is my goal with this; when I click on the button it will call my function (popCombo) which will then loop through 0 - 10, add the items to my list and then populate the combobox values with the values from my list. I thought I saw that this was possible using self.cc['values'] = val.

But for some reason its throwing a type error exception. TypeError: 'NoneType' object does not support item assignment. Does this mean that this type of operation cannot be done. I double checked my list and I def have values in it.

Thanks :)