[Python] How to filter the values of a table's column in SQLAlchemy Core

I know how to query on a model now. Suppose there is a Question model:

class Question(Base):
__tablename__ = "questions"
id=Column(...)
user_id=Column(...)
...


Now, I can do:

question = Session.query(Question).filter_by(user_id=123).one()


But, now, I have a table (not a model) questions:

questions = Table('questions', Base.metadata,
Column(id, ...),
Column(user_id, ...),
....)


How to query it as what I do with models?

Session.query(questions).filter_by(user_id=123).one()


This will report an error:

Traceback (most recent call last):
File "<console>", line 1, in <module>
File "E:\Python27\lib\site-packages\sqlalchemy-0.6.3-py2.7.egg\sqlalchemy\orm\query.py", line 851, in filter_by
for key, value in kwargs.iteritems()]
File "E:\Python27\lib\site-packages\sqlalchemy-0.6.3-py2.7.egg\sqlalchemy\orm\util.py", line 567, in _entity_descriptor
desc = entity.class_manager[key]
AttributeError: 'NoneType' object has no attribute 'class_manager'


But:

Session.query(questions).all()


is OK.

Is filter_by only work for models? How can I query on tables?

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