I really would like to discuss this "convention" as i don't understand it.

I can't see its advantage. The way you suggest makes lines unnecessarily long (longer than 80 chars in this case), it doesn't produce cleaner code, it's (minimally) slower and it makes refactoring harder (from my experience in rdflib).

Also I don't see the convention defined anywhere and i can't see a pattern in its use:

- https://github.com/gae-init/gae-init/blob/master/run.py

  ```
  from datetime import datetime
  from distutils import spawn
  ```

- https://github.com/gae-init/gae-init/blob/master/main/admin.py

  ```
  from flask.ext import wtf
  from google.appengine.api import app_identity
  from main import app
  ```

- https://github.com/gae-init/gae-init/blob/master/main/appengine_config.py

  ```
  from google.appengine.tools.devappserver2.python import stubs
  ```

- https://github.com/gae-init/gae-init/blob/master/main/auth.py

  ```
  from flask.ext import login
  from flask.ext import oauth
  from google.appengine.api import users
  from google.appengine.ext import ndb
  ```

- https://github.com/gae-init/gae-init/blob/master/main/config.py

  ```
  from datetime import datetime
  from google.appengine.api import app_identity
  ```

- https://github.com/gae-init/gae-init/blob/master/main/main.py

  ```
  from flask.ext import wtf
  ```

- https://github.com/gae-init/gae-init/blob/master/main/model.py

  ```
  from google.appengine.ext import ndb
  from config import APPLICATION_ID
  from config import CURRENT_VERSION_TIMESTAMP
  ```

- https://github.com/gae-init/gae-init/blob/master/main/task.py

  ```
  from google.appengine.api import mail
  from google.appengine.ext import deferred
  ```

- https://github.com/gae-init/gae-init/blob/master/main/user.py

  ```
  from flask.ext import wtf
  from google.appengine.ext import ndb
  from main import app
  ```

- https://github.com/gae-init/gae-init/blob/master/main/util.py

  ```
  from datetime import datetime
  from uuid import uuid4
  from google.appengine.datastore.datastore_query import Cursor
  from google.appengine.ext import blobstore
  from google.appengine.ext import ndb
  ```