@classmethod
def get_property_chunk_memcache_keys(self, property_class, key_prefix):
    num_props = len(property_class.all().fetch(limit=None, keys_only=True))
    l = list_to_chunks(range(0, num_props), self.MAX_CHUNK_SIZE)
    return [('%s|chunk%s' % (key_prefix, i)) for (i, val) in enumerate(l)]
@classmethod
def get_property_chunk_memcache_keys(self, property_class, key_prefix):
    num_props = len(property_class.all().fetch(limit=None, keys_only=True))
    l = list_to_chunks(range(0, num_props), self.MAX_CHUNK_SIZE)
    return [('%s|chunk%s' % (key_prefix, i)) for (i, val) in enumerate(l)]