Share connection between Django and SqlAlchemy

I am trying to share connection between Django and SqlAlchemy. I tried
following code:

from django.db import connection
from sqlalchemy import create_engine

def get_connection():
if connection.connection is None:
connection._cursor() # TODO: better way to open new
connection?
return connection.connection

engine = create_engine('postgresql+psycopg2://',
creator=get_connection)
engine.execute(s) # s - SqlAlchemy query

But this results in various fails in SqlAchemy (like connection is
already closed, can't execute some queries). More details are
available here: http://stackoverflow.com/questions/6439119/django-and-sqlalchemy-share-connection

So I have following question:

- does anyone know working solution?
- how big will be performance impact if I use separate connection for
Django and SqlAlchemy?
- any explanations why current code is not working :)

Thanks.

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