I got a simple test to work when deployed, but I get the following error from the development server:
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 301, in MakeSyncCall assert stub, 'No api proxy found for service "%s"' % service AssertionError: No api proxy found for service "rdbms"
Tried sample app given at https://code.google.com/apis/sql/docs/developers_guide_python.html