## Script (Python) "getLevelSession"
##bind container=container
##bind context=context
##bind namespace=
##bind script=script
##bind subpath=traverse_subpath
##parameters=level_doc,student_id,level_id
##title=
##
# $Id: getLevelSession.py 2439 2007-10-26 14:48:39Z joachim $
"""
return fixed session_id from level
"""
session_id = level_doc.session
changed = False
if len(session_id) == 2:
    pass
elif len(session_id) == 9:
    changed = True
    session_id = session_id[2:4]
if len(session_id) != 2:
    logger.info("invalid session %s in level %s for student %s" % 
                (session_id,level_id,student_id))
else:
    if changed:
        level_doc.edit(mapping={'session': session_id})
return session_id