# <aspects/cache.py>
class Cache():
    def __init__(self):
        self.values = set()
        self.value = None
cache = Cache()

def get(self):
    return cache.value

def set(self, value):
    if value:
        print "c New value: %s" % str(value)
    if any(cache.values):
        prev = ", ".join([str(val) for val in cache.values])
        print "c  Previous values: %s" % prev
    if value:
        cache.values = cache.values.union([value])
    cache.value = value