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A fast and simple probabilistic bloom filter that supports compression

Project Description

# Simple and fast pythonic bloomfilter

From wikipedia: "A Bloom filter is a space-efficient probabilistic data structure, conceived by Burton Howard Bloom in 1970, that is used to test whether an element is a member of a set. False positive matches are possible, but false negatives are not – in other words, a query returns either "possibly in set" or "definitely not in set". Elements can be added to the set, but not removed (though this can be addressed with a "counting" filter); the more elements that are added to the set, the larger the probability of false positives."

This filter supports:

Saving, reloading, compressed bloomfilter file lrzip like
for compression: lz4>lzo>zlib>bz2>lzma
for decompression: lzma>bz2>zlib>lzo>lz4
Stats
Entropy analysis
Internal and external hashing of data.
raw filter merging

Installing:

sudo pip install fastbloomfilter

External creating of the bloom filter file:

python mkbloom.py /tmp/filter.blf

Importing:

bf = BloomFilter(filename='/tmp/filter.blf')

Adding data to it:

bf.add('30000')
bf.add('1230213')
bf.add('1')

Adding data and at the same time querying it:

print bf.update('1') # True
print bf.update('1') # True

print bf.update('2') # False
print bf.update('2') # True

Printing stats:

bf.stat()

Or:

bf.info()

Querying data:

print bf.query('1') # True
print bf.query('1230213') # True
print bf.query('12') # False

Release history Release notifications

This version
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0.0.3

History Node

0.0.2

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0.0.1

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Filename, size & hash SHA256 hash help File type Python version Upload date
fastBloomFilter-0.0.3.tar.gz (6.5 kB) Copy SHA256 hash SHA256 Source None Oct 16, 2017

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