SQLAlchemy-legacy (The Python SQL Toolkit and Object Relational Mapper) SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL. This builds the legacy 1.4 version of SQLAlchemy, for packages which can't yet work with SQLAlchemy 2. Those of which are currently limited to buildbot. Beware that SQLAlchemy-legacy and SQLAlchemy conflicts and can't be installed at the same time! However most packages using SQLAlchemy-2 may work with SQLAlchemy-legacy hence this could be a proper fallback, if needed.