setValue not working in arcpy UpdateCursor

jameshickey

I am try to iterate over 3 feature datasets in 1 gdb and update a field value in all of the feature classes to "No".

ArcMap 10.4.1 Standard license. Windows 7

Here is my code. 

import arcpy
arcpy.env.workspace = r"PATH HERE"

#list of datasets
datasets = ["WaterDistribution", "WastewaterSystem", "Stormwater"]

#field to update
updateField = "AP_CHECKED"
#value to enter into field
value = "No"

for ds in datasets:
 for fc in arcpy.ListFeatureClasses("","",ds):
 print("Working on DS: {0}, FC: {1}" .format(ds, fc))
 cursor = arcpy.UpdateCursor(fc, updateField)
 for row in cursor:
 row.setValue(updateField, value)
 cursor.updateRow(row)

The code runs in the Idle window and the Datasets and FCs are listed from the print line but none of the values change in the db.