[Zope] session invalidate - using python

[p.t.]

Chris,
thanks for the very clear explanation.
In effect, I was trying to undestand how session expiring works, because 
I'm looking for a way to detect when a request coming from a browser 
associated to a session find the session expired.
Have you a suggestion?
TIA,
         p.t.

At 16:53 30/10/2002 -0500, Chris McDonough wrote:
>No.  By doing data.invalidate(), you've invalidated the data object
>(which means it will eventually be removed from the session data
>container), but that won't magically turn it in to the None object.
>
>It makes sense that on each call you're getting a new data object as
>you're invalidating the old one.
>
>getSessionData returns a session data object associated with the
>current browser id.  The "create=0" argument doesn't mean "dont
>create a session data object", it means "don't create a session data
>object unless there is a current browser id".  Since there is a
>current browser id, a session data object is returned instead of
>None.