python sqlalchemy中执行mysql操作需转义百分号

如果构建的sql中包含百分号，如：

INSERT INTO child (pk, data_id, material_type) VALUES ('5e995e464bec3a00067402f4_0', '5e995e464bec3a00067402f4', '28%');

则会报错：

ValueError: unsupported format character '?'

搜索后需要将’%‘替换为’%%’

sql = "INSERT INTO child (pk, data_id, material_type) VALUES ('5e995e464bec3a00067402f4_0', '5e995e464bec3a00067402f4', '28%%');"
sql = sql.replace('%', '%%')

参考：https://stackoverflow.com/a/11696152/7151777