code: def test_aggregate_2(self):
      foo = self.tables.foo
  
      query = fixture_session().query(func.avg(foo.c.bar))
      avg = query.filter(foo.c.bar < 30).one()[0]
      eq_(float(round(avg, 1)), 14.5)
  
imports: import sqlalchemy
  from sqlalchemy import ForeignKey
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import testing
  from sqlalchemy.orm import relationship
  from sqlalchemy.testing import config
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.fixtures import fixture_session
  from sqlalchemy.testing.provision import normalize_sequence
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
  from test.orm import _fixtures
label_desc: Use image node_id 8 for calling the GenerativeQueryTest obj's underlying member method code with example usage: obj.test_aggregate_2() without return types