##parameters=key=None
# $Id: getSessionsVoc.py 1986 2007-07-05 09:10:38Z henrik $
"""
Return the sessions as a vocabulary

"""
if key is None:
    # not used for WAeUPSessionWidget, only for SelectWidget
    l = [('','')]
    for y in range(1998,2015):
        l.append( ('%s' % str(y)[-2:],'%4d/%4d' % (y,y+1)))
    return l

try:
    y = int(key)
except:
    raise KeyError
if y == -1:
    raise KeyError
if y < 90:
    cent = 2000
elif y > 1000:
    cent = 0
else:
    cent = 1900
return "%4d/%4d" % (cent+y, cent+y+1)