How to update SQLAlchemy row entry?

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There are several ways to UPDATE using sqlalchemy

1) user.no_of_logins += 1
   session.commit()
   
2) session.query(User).\
       filter(User.username == form.username.data).\
       update({'no_of_logins': User.no_of_logins + 1})
   session.commit()

3) conn = engine.connect()
   stmt = User.update().\
       values(no_of_logins=User.no_of_logins + 1).\
       where(User.username == form.username.data)
   conn.execute(stmt)

4) setattr(user, 'no_of_logins', user.no_of_logins + 1)
   session.commit()

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