I'd like to use a custom comparasion function in a PythonScript to sort certain objects, using the sequence.sort utility function. In the doc-string for sort in sequence/SortEx.py, there is a line about custom function: - "xxx" -- a user-defined comparison function So I defined a comparasion function in the PythonScript and passed its name to sort. However, when the script is called, I got the error: * Module DocumentTemplate.sequence.SortEx, line 66, in sort * Module DocumentTemplate.sequence.SortEx, line 175, in make_sortfunctions AttributeError: 'NoneType' object has no attribute 'getitem' A closer look at make_sortfunctions shows that it tries to find the custom comparasion in the name space '_', which is default to None in sort(). So it seems I need only supply the correct name space as the third, undocumented parameter to sequence.sort for it to find my comparasion function. I tried to use globals() but this seems to be unavailable in a PythonScript. So the question is, how to pass the correct name space containing my comparasion function to the sort() function? My PythonScript code segment looks like below: results = ... def my_cmp(x, y): return cmp(x,y) sort_on = (('property', 'my_cmp', 'asc'),) return sequence.sort(results, sort_on) Thanks for advices. Best Regards, Hong Yuan