When using the Data Access module with the UpdateCursor class, row values cannot be updated to null.

参考情報

対処法

Use the old update cursor or use the Calculate Field geoprocessing tool.

def workaround0():

rows=arcpy.UpdateCursor(os.path.join(geodatabase, fcName))

for row in rows:

row.intField = None

rows.updateRow(row)

def workaround1():

arcpy.CalculateField_management(os.path.join(geodatabase, fcName), 'thisField', 'getNone()', 'PYTHON_9.3', r'def getNone():\n return None')

再現の手順