Thanks, I found the the related document here:

http://www.sqlalchemy.org/docs/05/session.html?highlight=dirty

But from the api refrence, I can't find any clue.

On 12月28日, 上午1时23分, Michael Bayer <mike...@zzzcomputing.com> wrote:
> if instance in session:
>         do something
> else:
>         do something else
>
> alternatively, you can explicitly say
>
> elif instance in session.new:
>
> On Dec 27, 2008, at 4:35 AM, Chen Houwu wrote:
>
>
>
> > I want to do as following:
>
> > if instance is Transient:
> >   do something
> > else instance is Pending:
> >   do something else
>
> > How can I accomplish it?
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