The following module allows you to create custom 
structseq objects from python.

It requires a patch to structseq.c in order to correctly 
allocate the type object on the heap.

I wasn't sure about the best way to allocate a type 
object on the heap, so this is my best effort.  I'm going 
to follow up with a posting to python-dev to see what 
others think.

This file will probably need to be updated to conform to 
python style standards.

Feel free to include this in the standard Python 
distribution.  I am willing to handle future updates/fixes 
for it.

This is related to bug 624827 filed by Fred L. Drake to 
add similar functionality.