Hi!

I have a question. May be someone able to give me advice. For example

 >>> users_table = Table('users', meta,
...     Column('user_id', Integer, primary_key=True),
...     Column('a', Integer)
... )

 >>> class User(object):
...     pass

 >>> mapper(User, users_table)
 >>> u = session.query(User).get(1)

What's the best way to add some value to `u.a`? I mean, safe way, 
because several processes want to add some value. Is it possible to do 
something like

 >>> u.a = u.a + 21
 >>> session.flush()

and give something like

     UPDATE users SET a = a + 21

?

Or do you know some other way?

Thanks!

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