Tk: Old Quit button

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examples/tk/quit.py

import tkinter as tk

class Example(tk.Frame):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.pack()
        self.createWidgets()

    def createWidgets(self):
        self.QUIT = tk.Button(self)
        self.QUIT["text"] = "QUIT"
        self.QUIT["fg"]   = "red"
        self.QUIT["command"] =  self.quit
        self.QUIT.pack({"side": "left"})

def main():
    root = tk.Tk()
    app = Example(parent=root)

    app.mainloop()

main()