editing - Using arcpy.da.Editor correctly?

I am attempting to remove duplicates in a feature class that are generated by a Python script. At the end of my script I have the code block below; I haven't implemented it yet, but would like to see if this is the correct way to use arcpy.da.Editor as the errors that I have been receiving are in regards to being outside of an edit session.

Is arcpy.da.Editor being used correctly here?

`

        fields = ['OBJECTID', 'SRNumber', 'ItemLoc_9']

        table_rows = []
        delete_rows = []


        where_clause =  """ ItemLoc_9 = ' '"""

        with arcpy.da.Editor(appendClass) as edit:
            with arcpy.da.SearchCursor(appendClass, fields, where_clause) as cursor:
                for row in cursor:
                    if [row[1], row[2]] in table_rows:
                        delete_rows.append(row[0])
                    else:
                        table_rows.append([row[1], row[2]])


                del table_rows

        with arcpy.da.UpdateCursor(appendClass, ['OBJECTID']) as cursor2:
            for row in cursor2:
                if row[0] in delete_rows:
                    print 'Deleting record: OBJECTID = ' + str(row[0])
                    cursor2.deleteRow()

                    print '\ndone'`