sqlalchemy exists for query
The following solution is a bit simpler:
from sqlalchemy.sql import existsprint session.query(exists().where(User.email == '...')).scalar()
The most acceptable and readable option for me is
session.query(<Exists instance>).scalar()like
session.query(User.query.filter(User.id == 1).exists()).scalar()which returns True or False.
There is no way that I know of to do this using the orm query api. But you can drop to a level lower and use exists from sqlalchemy.sql.expression:
from sqlalchemy.sql.expression import select, existsusers_exists_select = select((exists(users_query.statement),)) print engine.execute(users_exists_select).scalar()