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If for any reason you have an application which has run for a long time, it is possible that the session has expired since the session was originally created or loaded.
To check if a session is still valid use manager.valid(). The valid() method returns True if the session is valid, False otherwise and raises a SessionError if the session no longer exists.
It is also conceivably possible that the session has been cleaned up and no longer exists. To check if a session exists use manager.exists(). The exists() method returns True if the session exists, False otherwise but makes no comment on whether or not it is still valid or has expired.
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