Python 2.7 may be present in the SDK (which is great!), but it's still in experimental mode:<p>"Unfortunately, being on the bleeding edge means that we may make backwards-incompatible changes. We will inform the community once the Python 2.7 runtime is no longer experimental."<p><a href="http://code.google.com/appengine/docs/python/python27/newin27.html" rel="nofollow">http://code.google.com/appengine/docs/python/python27/newin2...</a>.