I am trying to calculate the parity left and parity right for my road center lines, but I do not know how to accomplish that in the field calculator. I was wondering if anyone had some prelogic python code that I could use to accomplish this. For example my parity left needs to be based upon the from and to fields for the left side of the road center line. Is it possible for me to use update cursor in the prelogic window in a field calculator?
