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import tkinter as tk



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

	def create_widgets(self):
		self.hi_there = tk.Button(self)
		self.hi_there["text"] = "Hello World\n(click me)"
		self.hi_there["command"] = self.say_hi
		self.hi_there.pack(side="top")
		self.quit = tk.Button(self, text="QUIT", fg="red", command=top.destroy)
		self.quit.pack(side="bottom")

	def say_hi(self):
		print("hi there, everyone!")



class Application(tk.Frame):

	def __init__(self, master=None):
		super().__init__(master)
		self.pack()
		self.create_widgets()

	def meldung():
		print("Hello!")

	def create_widgets(self):

		menubar = tk.Menu(root)
		filemenu = tk.Menu(menubar, tearoff=0)
		filemenu.add_command(label="Öffnen", command=Application.meldung)
		filemenu.add_command(label="Beenden", command=root.destroy)
		menubar.add_cascade(label="Datei", menu=filemenu)
		root.config(menu=menubar)

		self.hi_there = tk.Button(self)
		self.hi_there["text"] = "Hello World\n(click me)"
		self.hi_there["command"] = self.say_hi
		self.hi_there.pack(side="top")

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

	def say_hi(self):
		print("hi there, everyone!")
		top = tk.Toplevel()
		unterfenster = Unterfenster(master=top)



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