Yet another bloomfilter implementation in Python
Yet another Bloomfilter implementation in Python, compatible with Java's Guava library.
I was looking for a Python library which is capable of reading what Bloomfilter of Java's Guava library serializes and is also able to output byte array which is recognizable by Java. But unfortunately failed. Hence I developed this library by borrowing how Guava implements Bloomfilter serialization/deserialization a lot to deal with Bloomfilters on both Python and Java sides.
As for Bloomfilter usage in Java world, please refer to this post.
Here's a brief introduction to Bloomfilter.
- Python 3.7+
This library is not tested under Python 3.6 and lower versions.
pip install bloomfilter-py
>>> from bloomfilter import BloomFilter >>> bloom_filter = BloomFilter(expected_insertions=500, err_rate=0.01) >>> for i in range(100): ... bloom_filter.put(i) ... >>> 1 in bloom_filter True >>> 100 in bloom_filter False >>>
You can easily serialize
BloomFilter instance to a byte array
>>> dumps = bloom_filter.dumps() >>> with open("dumps.out", "wb") as f: ... f.write(dumps) ... >>>
or to a hex string
>>> hex_str = bloom_filter.dumps_to_hex()
or to a base64 encoded bytes
base64_bytes = bloom_filter.dumps_to_base64()
And you can easily initialize a
BloomFilter instance from a byte array
>>> with open("dumps.out", "rb") as f: ... bf = BloomFilter.loads(f.read()) ... >>> 1 in bf True >>> 100 in bf False >>>
or from a hex string
>>> bf = BloomFilter.loads_from_hex(hex_str) >>> 1 in bf True >>> 100 in bf False
or from a base64 encoded bytes
>>> bf = BloomFilter.loads_from_base64(base64_bytes) >>> 100 in bf False >>> 200 in bf False >>> 1 in bf True >>> 99 in bf True
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