class_docstr: The debugger interface.
  
  This class handles the drawing of the debugger window and
  the interactions with the underlying debugger session.
code: def show_frame(self, stackitem):
      self.frame = stackitem[0]  # lineno is stackitem[1]
      self.show_variables()
  
imports: import bdb
  import os
  from tkinter import *
  from tkinter.ttk import Frame, Scrollbar
  from idlelib import macosx
  from idlelib.scrolledlist import ScrolledList
  from idlelib.window import ListedToplevel
label_desc: Use image node_id 16 for calling the Debugger obj's underlying member method code with example usage: obj.show_frame(stackitem) without return types