2006/3/13, henry show <henryshow at gmail.com>: > i am new to ironpython, so my question might be silly: > why i can not even import os and atexit? You need to copy Lib directory from CPython 2.4 distribution. (And delete site.py after copying.) To import os module, you need os, ntpath or posixpath, stat, copy_reg, and types module. Seo Sanghyeon