Reloading from a File does not appear to work in python 3

[bscain]

The following sample code has been executed on both python 2 and python 3 with the same result

from pybloom_live import BloomFilter

if __name__ == '__main__':

    bf1 = BloomFilter(capacity=1000, error_rate=0.001)
    bf2 = BloomFilter(capacity=1000, error_rate=0.001)
    
    bf1.add(1)
    bf1.add(2)
    
    print("Test 1 in bf1: " + str(1 in bf1))
    print("Test 2 in bf1: " + str(2 in bf1))
    
    with open("/tmp/bloomTest.txt", "wb") as fp:
        bf1.tofile(fp)
    
    with open("/tmp/bloomTest.txt", "rb") as fp2:
        bf2.fromfile(fp2)
        
    print("Test 1 in bf2: " + str(1 in bf2))
    print("Test 2 in bf2: " + str(2 in bf2))

Output:
Test 1 in bf1: True
Test 2 in bf1: True
Test 1 in bf2: False
Test 2 in bf2: False

[bscain]

Turns out I was using it incorrect, recommend adding samples on how to use the to / from file

I will take a look at it as soon as I can. Thanks @bscain

[evanfoster]

@bscain would you be able to comment with a very short example of how to use this feature? I'd just read the source but I'm away from my computer. No worries if you aren't able to, I'll do it once I can.

[paularmand]

This should work:

from io import BytesIO
bytesio = BytesIO()

# sbf is your scalable bloom filter
sbf.tofile(bytesio)

# reset the stream handle to the start
bytesio.seek(0)
# you can check it with: print(bytesio.getvalue().hex())

sbf_read = pybloom_live.ScalableBloomFilter.fromfile(bytesio)
bytesio.close()

[Huangvivi]

The following sample code has been executed on both python 2 and python 3 with the same result

from pybloom_live import BloomFilter

if __name__ == '__main__':

    bf1 = BloomFilter(capacity=1000, error_rate=0.001)
    bf2 = BloomFilter(capacity=1000, error_rate=0.001)
    
    bf1.add(1)
    bf1.add(2)
    
    print("Test 1 in bf1: " + str(1 in bf1))
    print("Test 2 in bf1: " + str(2 in bf1))
    
    with open("/tmp/bloomTest.txt", "wb") as fp:
        bf1.tofile(fp)
    
    with open("/tmp/bloomTest.txt", "rb") as fp2:
        bf2.fromfile(fp2)
        
    print("Test 1 in bf2: " + str(1 in bf2))
    print("Test 2 in bf2: " + str(2 in bf2))

Output:
Test 1 in bf1: True
Test 2 in bf1: True
Test 1 in bf2: False
Test 2 in bf2: False

Hey guy, I met this problem at a time, then I found the method fromfile is a classmethod.
It means you don't need to initial bf2 with args, just

with open("/tmp/bloomTest.txt", "rb") as fp2:
    bf2 = BloomFilter.fromfile(fp2)

It works for me