> Performance difference between this approaches less than zero.

less than? i doubt that... if you import the module it's one lookup more (at least in theory)

> code convention is code convention

That's a counter productive and egging statement when i explicitly ask to discuss a detail of the code conventions which is unclear to me and seemingly to you as well as shown by the examples.

> rule is simple - if it possible, use the import module

That's actually valuable feedback. Should be put in http://docs.gae-init.appspot.com/convention/#python

Shall these ones be fixed (outside of this PR) or are they exceptions for some reason?

```
from util import uuid
from config import APPLICATION_ID
from config import CURRENT_VERSION_TIMESTAMP
from google.appengine.datastore.datastore_query import Cursor
```