I created a short model to update one field based on another in a SQl geodatabase using modelbuilder, exported it to python, however it only works in pyscripter not in python.
It seems Calculate field cannot use VB expressions in 64-bit ArcGIS products. I'm not sure of python so can anyone tell me how to change this vb code into python in the Code Block of Calculate Field
If IsNull ([ColumnA]) then
[ColumnA] = [ColumnB]
ColumnA is a date field so if it is Null then update it with ColumnB (text field).