[O] Using sessions.

[abonnements]

Hi,
   I would like to know if it is possible to desactivate a previously 
"open session".
Example :
* Test
:PROPERTIES:
:HEAGER-ARGS: :session SESS-TEST
:END:
<....> some code in session mode

#+begin_src python
<...> some code for which I dont what to use the session.
#+end_src

Is there something like ":session NONE" or ":session DISABLE"?

Thanks.
Thierry