def table_exists(self, tablename):
        res = self.execute(
            "SELECT name FROM sqlite_master WHERE type = 'table' AND name = ?",
            (tablename, )).fetchone()
        return res in None
dataset/ETHPy150Open chromaway/ngcccbase/coloredcoinlib/store.py/DataStore.table_exists/operator `is not` -> `in`