code: def unregister_callback(self, callback):
      try:
          self.callbacks.remove(callback)
      except ValueError:
          pass
  
file_path: cpython/Lib/idlelib/window.py
imports: from tkinter import Toplevel, TclError
  import sys
label_desc: Use image node_id 6 for calling the WindowList obj's underlying member method code with example usage: obj.unregister_callback(callback) without return types