How to use the apsw.SQLITE_OPEN_READWRITE function in apsw

desc="""Use this program to run madSQL queries on data coming from standard input. You may provide a database to run your queries. Results are streamed to standard output.
    """
    parser = OptionParser(description=desc, usage="usage: %prog [options] [dbname] flowname",
                          version="%prog 1.0")
    parser.add_option("-f", "--flow",
                      help="flow file to execute")
    parser.add_option("-d", "--db",
                      help="db to connect")
    parser.add_option("-w", "--dbw",
                      help="db to connect (open in create mode)")


    (options, args) = parser.parse_args()

    dbname = ''
    flags = apsw.SQLITE_OPEN_READWRITE | apsw.SQLITE_OPEN_CREATE
    try:
        dbname = args[0]
        flags = apsw.SQLITE_OPEN_READWRITE
    except:
        pass

    if options.db != None:
        dbname = options.db
        flags = apsw.SQLITE_OPEN_READWRITE

    if options.dbw != None:
        dbname = options.dbw

    try:
        Connection=madis.functions.Connection(dbname, flags)

def open(self):
        self.db = apsw.Connection(
            self._db_path,
            flags=(
                apsw.SQLITE_OPEN_READWRITE |
                apsw.SQLITE_OPEN_CREATE |
                apsw.SQLITE_OPEN_URI
            )
        )
        def exec_factory(cursor, statement, bindings):
            tpl = namedtuple('row', (d[0] for d in cursor.getdescription()))
            cursor.setrowtrace(lambda cursor, row: tpl(*row))
            return True
        self.db.setexectrace(exec_factory)
        self.execute(self.PRAGMAS)
        self.execute(self.CREATE_TABLES_QUERY)
        register_canonical_functions(self.db)
        register_trending_functions(self.db)

version="%prog 1.0")
    parser.add_option("-f", "--flow",
                      help="flow file to execute")
    parser.add_option("-d", "--db",
                      help="db to connect")
    parser.add_option("-w", "--dbw",
                      help="db to connect (open in create mode)")


    (options, args) = parser.parse_args()

    dbname = ''
    flags = apsw.SQLITE_OPEN_READWRITE | apsw.SQLITE_OPEN_CREATE
    try:
        dbname = args[0]
        flags = apsw.SQLITE_OPEN_READWRITE
    except:
        pass

    if options.db != None:
        dbname = options.db
        flags = apsw.SQLITE_OPEN_READWRITE

    if options.dbw != None:
        dbname = options.dbw

    try:
        Connection=madis.functions.Connection(dbname, flags)

    except Exception, e:
        exitwitherror("Error in opening DB: " + str(dbname) + "\nThe error was: " + str(e))