code: def open(self, event=None, editFile=None):
      flist = self.editwin.flist
      # Save in case parent window is closed (ie, during askopenfile()).
      if flist:
          if not editFile:
              filename = self.askopenfile()
          else:
              filename = editFile
          if filename:
              # If editFile is valid and already open, flist.open will
              # shift focus to its existing window.
              # If the current window exists and is a fresh unnamed,
              # unmodified editor window (not an interpreter shell),
              # pass self.loadfile to flist.open so it will load the file
              # in the current window (if the file is not already open)
              # instead of a new window.
              if (
                  self.editwin
                  and not getattr(self.editwin, "interp", None)
                  and not self.filename
                  and self.get_saved()
              ):
                  flist.open(filename, self.loadfile)
              else:
                  flist.open(filename)
          else:
              if self.text:
                  self.text.focus_set()
          return "break"
  
      # Code for use outside IDLE:
      if self.get_saved():
          reply = self.maybesave()
          if reply == "cancel":
              self.text.focus_set()
              return "break"
      if not editFile:
          filename = self.askopenfile()
      else:
          filename = editFile
      if filename:
          self.loadfile(filename)
      else:
          self.text.focus_set()
      return "break"
  
imports: import io
  import os
  import shlex
  import sys
  import tempfile
  import tokenize
  from tkinter import filedialog
  from tkinter import messagebox
  from tkinter.simpledialog import askstring
  from idlelib.config import idleConf
  from idlelib.util import py_extensions
label_desc: Use image node_id 8 for calling the IOBinding obj's underlying member method code with example usage: obj.open(event, editFile) and returns: str, str, str