Nested searchcursor to update the nesting data

Discussion created by GEOlson86 on Feb 20, 2014
Latest reply on Feb 24, 2014 by rfairhur24
I have a script that uses one layer to select features of a second layer in the first loop of the script.  When the second layer's features are selected, I have a second loop that is supposed to update the fields on the first layer in the first loop.   Is there a specific way of using an updateCursor or setValue to affect the nesting loop?

for row1 in rows1:
    count = 1
    print "row %d" %parcelrow
    parcelrow = parcelrow +1
    selectcount = 0
    currentPIN = row1.getValue(selectField)
    arcpy.SelectLayerByAttribute_management(mapLyr1, "NEW_SELECTION", "\"%s\" = '%s'" %(selectField, currentPIN))
    print currentPIN
    arcpy.SelectLayerByAttribute_management(mapLyr2, "ADD_TO_SELECTION", "\"%s\" = '%s'" %(selectField, currentPIN))
    selectcount = int(arcpy.GetCount_management(mapLyr2).getOutput(0))
    print "%d points selected" %selectcount
    if selectcount == 0:
        arcpy.SelectLayerByAttribute_management(mapLyr1, "CLEAR_SELECTION")
        for row2 in rows2:
            hydrantfield = copytoField + "%d" %count
            print "filling field " + hydrantfield
            hydrID = row2.getValue(copyField)

#This setValue is supposed to update mayLyr1

            row1.setValue(hydrantfield, hydrID)
            count = count + 1
    arcpy.SelectLayerByAttribute_management(mapLyr1, "CLEAR_SELECTION")
    arcpy.SelectLayerByAttribute_management(mapLyr2, "CLEAR_SELECTION")

The second loop seems to get stuck.  Shouldn't the loop only run through the selected features then continue back to the first loop?