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import tkinter as tk
from tkinter import *

class Application(tk.Frame):
    def __init__(self, master=None):
        super().__init__(master)
        self.pack()

        self.btn = tk.Button(self)
        self.btn["text"] = "Start"
        self.btn["command"] = self.report()
        self.btn.pack(side="right")

        self.btnQuit = tk.Button(self, text="QUIT", fg="red",command=root.destroy)
        self.btnQuit.pack(side="right")

        self.tB = Text()
        self.tB.insert(END, "Gurkensalat\nCurrywurst\nPommes\n")
        self.tB.pack(side="right")

    def report(self):
        self.tB.insert(END, "Just a text Widget\nin two lines\n")
        

root = tk.Tk()
app = Application(master=root)
app.mainloop()