How to use NOT IN clause in sqlalchemy ORM query

how do i convert the following mysql query to sqlalchemy?

SELECT * FROM `table_a` ta, `table_b` tb where 1
AND ta.id = tb.id
AND ta.id not in (select id from `table_c`)

so far i have this for sqlalchemy:

query = session.query(table_a, table_b)
query = query.filter(table_a.id == table_b.id)

The ORM internals describe the not_in() operator (previously notin_()), so you can say:

query = query.filter(table_a.id.not_in(subquery))
#                               ^^^^^^

From the docs:

>inherited from the ColumnOperators.not_in() method of ColumnOperators > > implement the NOT IN operator. > >This is equivalent to using negation with ColumnOperators.in_(), i.e. ~x.in_(y).

Note that version 1.4 states:

> The not_in() operator is renamed from notin_() in previous releases. The previous name remains available for backwards compatibility.

So you may find notin_() in some cases.

Try this:

subquery = session.query(table_c.id)
query = query.filter(~table_a.id.in_(subquery))

Note: table_a, table_b and table_c should be mapped classes, not Table instances.

here is the full code:

#join table_a and table_b
query = session.query(table_a, table_b)
query = query.filter(table_a.id == table_b.id)

# create subquery
subquery = session.query(table_c.id)
# select all from table_a not in subquery
query = query.filter(~table_a.id.in_(subquery))