Buttons not appearing, first time button making

[admiral_hawk]

Hi, I have been watching python tutorials and finally got to GUI and have been trying to figure out buttons, I typed in the code as instructed however when the window opens there is still no quit button. Been looking at this for a while now and can't seem to figure out whats wrong. Am I perhaps missing a tkinter file? Here is the code:

from tkinter import *

class Window (Frame) :

    def __init__(self, master = None) :
        Frame.__init__(self, master)
        self.master = master
        self.init_window()

def init_window(self) :
    self.master.title("GUI")
    self.pack(fill=BOTH, expand=1)
    quitButton = Button(self, text="Quit")
    quitButton.place(x=0, y=0)

root = Tk()
root.geometry("400x300")
app = Window(root)
root.mainloop()