[python] python driver throws exception which is can not catch when using cursor after connection close

        def test_01Exceptions(self):
            con =  self.con
            error = 0
            errorValue = ''
            try:
                cur = con.cursor()
                cur.execute("insert into exceptions_t values error_sql('Hello') ")
            except CUBRIDdb.DatabaseError, e:
                error = 1
                errorValue = str(e)
            finally:
                con.close()
            #print >>sys.stderr,  "\nException...Error %d: %s" % (e.args[0], e.args[1])
            self.assertEqual(error, 1, "catch one except.")
            #print "\n", e.args[0]
            #print "\n", errorValue
            self.assertEquals(errorValue,"(-493, \"ERROR: DBMS, -493, Syntax: In line 1, column 33 before \'(\'Hello\') \'\\nSyntax error: un
expected \'error_sql\', expecting \'(\' \")")

            error = 0
            errorValue = ''
            try:
                cur = con.cursor()
                cur.fetchone()
                cur.execute("insert into exceptions_t values ('forrollback',6,66, 10) ")
            except CUBRIDdb.Error, e:
                error = 1
                errorValue = str(e)
                #print >>sys.stderr,  "\nException...Error %d: %s" % (e.args[0], e.args[1])
            except Exception,e1:
                print "\n",str(e1)
            self.assertEqual(error, 1, "catch one except. OK.")
            self.assertEquals(errorValue, "(-20002, 'ERROR: CCI, -20002, Invalid connection handle')")

+ python python/_13_exceptions/test_exceptions.py
test_01Exceptions (__main__.ExceptionsTest) ... Exception AttributeError: "'Cursor' object has no attribute '_cs'" in <bound method Cursor.__del__ of <CUBRIDdb.cursors.Cursor object at 0x5302550>> ignored
ok
test_02Exceptions (__main__.ExceptionsTest) ... 
connect url is empty
ok

----------------------------------------------------------------------
Ran 2 tests in 0.066s

OK

Exception AttributeError: "'Cursor' object has no attribute '_cs'" in <bound method Cursor.__del__ of <CUBRIDdb.cursors.Cursor object at 0x5302550>> ignored"