python – when used to target objects in tkinter, the Side option of the Pack method works

import tkinter

Class App:
def init(self, master):
self.frame = tkinter.Frame (Master)
self.frame.pack ()
self.bt = tkinter.Button (self.frame, text = & # 39; ok & # 39;
self.bt.pack (side = & # 39; left & # 39;)

toplevel = tkinter.Tk ()
instance_app = app (top level)
toplevel.mainloop () Insert here the description of the picture