C:\Python33>python Lib/idlelib/idle.py
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python33\Lib\tkinter\__init__.py", line 1442, in __call__
    return self.func(*args)
  File "C:\Python33\Lib\tkinter\__init__.py", line 501, in callit
    func(*args)
  File "C:\Python33\Lib\idlelib\ColorDelegator.py", line 154, in recolorize
    self.recolorize_main()
  File "C:\Python33\Lib\idlelib\ColorDelegator.py", line 187, in recolorize_main
    next = self.index(mark + "+%d lines linestart" %
  File "C:\Python33\Lib\idlelib\Delegator.py", line 10, in __getattr__
    attr = getattr(self.delegate, name) # May raise AttributeError
AttributeError: 'NoneType' object has no attribute 'index'
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python33\Lib\tkinter\__init__.py", line 1442, in __call__
    return self.func(*args)
  File "C:\Python33\Lib\idlelib\EditorWindow.py", line 875, in open_recent_file
    self.io.open(editFile=fn_closure)
  File "C:\Python33\Lib\idlelib\IOBinding.py", line 180, in open
    flist.open(filename)
  File "C:\Python33\Lib\idlelib\FileList.py", line 36, in open
    edit = self.EditorWindow(self, filename, key)
  File "C:\Python33\Lib\idlelib\PyShell.py", line 113, in __init__
    if self.io.filename: self.restore_file_breaks()
  File "C:\Python33\Lib\idlelib\PyShell.py", line 229, in restore_file_breaks
    filename = self.io.filename
AttributeError: 'NoneType' object has no attribute 'filename'