Buttons not appearing, first time button making

[Axel_Erfurt]

the indentation is wrong

try

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()