布隆过滤器 python 实现
from bitarray import bitarray
import mmh3
class BloomFilter:
def __init__(self, size, hash_num):
self.size = size
self.hash_num = hash_num
self.bit_array = bitarray(size)
self.bit_array.setall(0)
def add(self, s):
for seed in range(self.hash_num):
result = mmh3.hash(s, seed) % self.size
self.bit_array[result] = 1
def lookup(self, s):
for seed in range(self.hash_num):
result = mmh3.hash(s, seed) % self.size
if self.bit_array[result] == 0:
return "Nope"
return "Probably"
bf = BloomFilter(500000, 7)
bf.add("dantezhao")
print (bf.lookup("dantezhao"))
print (bf.lookup("yyj"))
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