SQLAlchemy, dynamic table creation

horrible.py

def init_i18n_class(cls):
    """Create, via metadata reflection, an I18N class object
    for i18n-enabled tables."""
    tablename = cls.__tablename__ + "_i18n"
    if Base.metadata.tables.get(tablename) is not None: 
        classname = cls.__name__ + "I18N"
        i18nt = Table(tablename, Base.metadata, 
                Column("id", ForeignKey("%s.id" % cls.__tablename__), primary_key=True),
                Column("culture", String(25), primary_key=True),
                ForeignKeyConstraint(["id"], ["%s.id" % cls.__tablename__]),
                autoload=True, extend_existing=True)
        globals()[classname] =type(classname, (Base,), dict(__table__=i18nt))
        setattr(cls, tablename, relationship(classname, cascade="all,delete-orphan",
                primaryjoin="%s.id == %s.id" % (classname, cls.__name__)))