python - arcpy.da.UpdateCursor - How to update last column from Field Name List?

examples:

for field in arcpy.ListFields(fc):
    if field.name != 'Hi': 
        arcpy.AddField_management(fc, 'Hi', 'FLOAT')
    else:
        print "kolona Hi vec postoji"


with arcpy.da.UpdateCursor(fc, (fieldNameList)) as cursor:

    for row in cursor:

                hi = sum(np.array([row[i]/(sum([row[i] for i in range(len(fieldNameList))])) for i in range(len(fieldNameList))])**2)
                row[14] = hi # row[LAST] = hi ?????

                cursor.updateRow(row)


    del row
    del cursor

That instead of row[14] use the last column of the defined list? examples:

row[last] = hi

Answer

Try the last element list selector used in Python:

row[-1] = hi