I think I figured it out (though, it wasn't documented).  What I needed was to use:

cmd.get_model(selection, STATE)

I think that's the correct usage?  What I needed was to loop through a selection and then to calculate the sugar pucker information.  However, not all atoms from the selection are required for the calculation so some pre-parsing of the residue is needed.  It appears that I can specify the state to obtain atom objects from via the get_model command.  I hope that is right?


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