class_docstr: The debugger interface.
  
  This class handles the drawing of the debugger window and
  the interactions with the underlying debugger session.
code: def __frame2fileline(self, frame):
      code = frame.f_code
      filename = code.co_filename
      lineno = frame.f_lineno
      return filename, lineno
  
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 7 for calling the Debugger obj's underlying member method code with example usage: obj.__frame2fileline(frame) and returns: filename,  lineno