Strange behavior of .filename() method

[ewestern]

b = hydra.WritingBloomFilter(10000, 0.1, filename='/tmp/foo') b.filename() '' b.add('asd') b.add('sdsds') b.fdatasync() b.filename() '' b = hydra.WritingBloomFilter(10000, 0.1) b.add('asd') b.add('sdsds') b.filename() 'e'

$ uname -a
Linux ip-* 4.4.0-1020-aws #29-Ubuntu SMP Wed Jun 14 15:54:52 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

$ cython --version
Cython version 0.27.3

$ python --version
Python 2.7.12

I'd like to be able to retrieve the path of the mmaped file once the bloom is closed.