We can de-reference more easily if we do:

for vNdx in some_index_list:          # Loop through vertices
    vX,vY,vZ = [i for i in verts_list[vNdx]]     # get desired vertex

or, for multi-level arrays:

for vNdx in some_index_list:          # Loop through vertices
    vert = [[j for j in i] for i in verts_list[vNdx]]     # get desired vertex
    (Then we'll need to sort out the inner levels....)

I don't think we go three deep anywhere, do we?
   

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.