BloomFilter.__len__(item) misreports after BloomFilter.open(filename)

[235]

It's a minor issue, alas, it requires changes to the file format which might be a hassle.

>> fruit = pybloomfilter.BloomFilter(100000, 0.1, '/tmp/words.bloom')
>> fruit.update(('apple', 'pear', 'orange', 'apple'))
>> len(fruit)
3
>> fruit.sync()

>> basket =  pybloomfilter.BloomFilter.open('/tmp/words.bloom')
>> 'orange' in basket
True
>> len(basket)
0
-- However, this should be 3.

[DYFeng]

I meet the same problem...