67. WordBank.mayBe(): Add one word choice
to a slot
For each slot S, self.__choiceMap[S] is a set of the choices for
slot S, as Word instances,
and self.__wordToSlots[W] is the set of
slots that have word W in their choices.
We must also track the total number of choices in the
whole puzzle, self.__totalChoices.
kkck
# - - - W o r d B a n k . m a y B e
def mayBe ( self, slot, word ):
'''Add word as one choice for slot.
'''
#-- 1 --
# [ if self.__choiceMap has an entry for (slot) ->
# self.__choiceMap +:= word
# else ->
# self.__choiceMap := a new set containing word ]
if VERBOSE: print "=== Slot %s may be %s" % (slot,word)
self.__choiceMap[slot].add ( word )
self.__wordToSlots[word].add ( slot )
#-- 2 --
self.__totalChoices += 1
