strange error when importing a module

[Robin Becker]

I'm trying to understand the following strangeness

C:\code\rlextra\ers>python
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> from rlextra.utils.SimpleXMLRPCServer import SimpleXMLRPCServer
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File "c:\code\rlextra\utils\SimpleXMLRPCServer.py", line 148, in ?
     import pydoc
   File "C:\Python\lib\pydoc.py", line 54, in ?
     import sys, imp, os, re, types, inspect, __builtin__
   File "C:\Python\lib\inspect.py", line 31, in ?
     import sys, os, types, string, re, dis, imp, tokenize, linecache
   File "C:\Python\lib\tokenize.py", line 38, in ?
     COMMENT = N_TOKENS
NameError: name 'N_TOKENS' is not defined

SimpleXMLRPCServer.py is a legacy version of the current SimpleXMLRPCserver 
code. I don't think there's anything special about it and as a standalone script 
it appears to work fine (ie it seems to compile and run).

Any ideas?
-- 
Robin Becker