It seems that https://github.com/zopefoundation/Products.ZSQLMethods/blob/7975c1a3c3d34f8fdc6cd667e08981dc909e3c24/src/Shared/DC/ZRDB/Connection.py#L207 is not Python 2 compatible. I tried to see if it is covered by tests but https://coveralls.io/github/zopefoundation/Products.ZSQLMethods just hast `src/Products`.