Okay, I will be blunt. Please fix http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=6805 It's not like it's difficult! It can be fixed in exact same way it was fixed in 1.1! IronPython/Runtime/calls/FunctionCode.cs ArgCount property If ArgumentList flag is set, decrease by one If KeywordDictionary flag is set, decrease by one Thanks. -- Seo Sanghyeon