Note to people rushing out to try the new version: the development server doesn't work with it yet. You can only deploy to production at the moment.

Some very cool features with this upcoming release:

- Cross entity-group transactions

- Bundled libraries (with multiple version support)

- More quotas being increased

- Native WSGI support

More info here: https://sites.google.com/site/gaepython27testing/

http://groups.google.com/group/google-appengine-python/brows...

NumPy! Woo! This is a big deal for writing data-intensive backends. There was a great outcry of happiness on the ticket system when this got announced.

Now all we need is SciPy and matplotlib and we'll be in business...

FYI, the Python 2.7 runtime is only supported for apps using the High Replication Datastore.

This is important to note for any 'older' apps that were created before HRD was enabled.

http://code.google.com/appengine/docs/python/datastore/hr/#S...

I can totally appreciate the fact that they've kicked it in the ass to get python 2.7 working for concurrent requests, in light of their recent pricing changes.

But I have an old app (thathigh.com) that does not use the high replication datastore. I never transitioned it, because quite frankly it wasn't worth the effort.

Now I have to do three things: move from django 0.96 to 1.2 (no small feat), bring my app down in order to migrate everything to high replication datastore, and then ensure all my queries work like they did before.

That's not a small amount of work, especially since it's a side project.

I just migrated an app.

I had to make a few updates to app.yaml, remove use_library() references in the code, create a new config file that permits the old app to write to the new app, disable billing on the old app and enable it on the new one (will take a few days for this to resolve), disable writes on the old app, switch over my Google Domain config to point to the new app, and a few other things I'm forgetting.

Not as bad as I thought it would be, but still non-trivial and this was for a relatively simple app.

If you're considering making the switch, take a look at http://code.google.com/appengine/docs/adminconsole/datastore...

There are a lot more advantages to moving your app to HRD, like no more random datastore timeouts. There is also a new migration in limited testing right now that will allow you to migrate your data in multiple passes, which will minimize the read-only time required for your app to migrate.

Official docs here:

http://code.google.com/appengine/docs/python/python27/

Finally, native JSON support.

This is huge news. GAE's making advances that are making it more of a viable prototyping way to get MVPs out in absolutely no time. I'm excited by the possibilities!

I'm not sure if this belongs here, but what about Python 3? I haven't seen too much about Python3 in the late days as the way I have seen about 2.7.

I'm sure Python 3 is on the radar. But given the choice between spending the time to support 2.7 or 3, choosing 2.7 is a no-brainer. Compatibility for Python 3 has improved quite a bit, but hell, Django doesn't even work on it.