Hello all, I've just submitted a patch on sourceforge to make inspect compatible with IronPython (and Jython I think). This patch originally comes from the IPCE ( http://fepy.sf.net ) project by Seo Sanghyeon. It is a trivial change really. The patch is number 1739696 http://sourceforge.net/tracker/index.php?func=detail&aid=1739696&group_id=5470&atid=305470 It moves getting a reference to 'code.co_code' into the body of the loop responsible for inspecting anonymous (tuple) arguments. In IronPython, accessing 'co_code' raises a NotImplementedError - meaning that inspect.get_argspec is broken. This patch means that *except* for functions with anonymous tuple arguments, it will work again on IronPython - whilst maintaining full compatibility with the previous behaviour. Jython has a similar patch to overcome the same issue by the way. See http://jython.svn.sourceforge.net/viewvc/jython?view=rev&revision=3200 As it is a bugfix - backporting to 2.5 would be great. Should I generate a separate patch? All the best, Michael Foord