@classmethod
    def _load_fixtures(cls):
        """Insert rows as represented by the fixtures() method."""
        headers, rows = {}, {}
        for table, data in cls.fixtures().items():
            if len(data) < 2:
                continue
            if isinstance(table, util.string_types):
                table = cls.tables[table]
            headers[table] = data[0]
            rows[table] = data[1:]
        for table in cls.metadata.sorted_tables:
            if headers not in table:
                continue
            cls.bind.execute(
                table.insert(),
                [dict(zip(headers[table], column_values))
                 for column_values in rows[table]])
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/testing/fixtures.py/TablesTest._load_fixtures/swapped operands of `not in`