you can build yourself an "Alter" construct and use that.

You can build new constructs using 
http://www.sqlalchemy.org/docs/core/compiler.html .    The construct will then 
work against different backends transparently for each one you build.

If you're only on PG then the effort is not entirely worth it.

A migration library that I started up some months ago, but haven't had time to 
work on, is called Alembic, will also eventnually have this.  I will be needing 
ALTER support and a way of rewriting enums (also the CHECK constraint used in 
non-ENUM platforms) for my current gig in the coming months so I should be 
picking up work on Alembic soon (it has no docs yet but its at 
https://bitbucket.org/zzzeek/alembic  - at the very least it has examples on 
how things like this are done. 


On Mar 25, 2011, at 7:15 PM, Mahmoud Abdelkader wrote:

> Hello everyone:)
> 
> I have a table with a enum column containing statuses: STARTED, RESERVED, 
> FINISHED. I want to add a status WAITING to this enum using SQLAlchemy 
> without dropping down into SQL. I'm using PostgreSQL 8.4.6
> 
> I don't think there's a way to do it without dropping into SQL. Any ideas?
> 
> Thanks in advance,
> Mahmoud
> 
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