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    You have to make a search cursor on the "JoinLayer" after selection and extract the value from the searched row(s)... if any, so be prepared for None! Note by the time you get to the del statement your cursor no longer exists and will probably cause an error, the with statement negates the need for del. Commented Apr 12, 2017 at 1:00
  • You're mixing old style cursors with new da style. pp_trans_GUJoin.GEN_UNITS/subLayer.LINES isn't valid. Commented Apr 12, 2017 at 4:53