Very simple way to compare Chromaprint fingerprints

fpcmp.py

import chromaprint


popcnt_table_8bit = [
    0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
    1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
    1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
    2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
    1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
    2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
    2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
    3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8,
]

def popcnt(x):
    """
    Count the number of set bits in the given 32-bit integer.
    """
    return (popcnt_table_8bit[(x >>  0) & 0xFF] +
            popcnt_table_8bit[(x >>  8) & 0xFF] +
            popcnt_table_8bit[(x >> 16) & 0xFF] +
            popcnt_table_8bit[(x >> 24) & 0xFF])


fps = []
for line in open('fp.log').readlines():
    if line.startswith('FINGERPRINT='):
        encoded = line.split('=', 1)[1].strip()
        fps.append(chromaprint.decode_fingerprint(encoded)[0])

for i, fp1 in enumerate(fps):
    for j, fp2 in enumerate(fps):
        if i >= j:
            continue
        error = 0
        for x, y in zip(fp1, fp2):
            error += popcnt(x ^ y)
        print i, j, 1.0 - error / 32.0 / min(len(fp1), len(fp1))

I thing it's wrong
print i, j, 1.0 - error / 32.0 / min(len(fp1), len(fp1))
may be
print i, j, 1.0 - error / 32.0 / min(len(fp1), len(fp2))