def insert_hash_compare():

    # input value
    value_mongo1 = request.form['id1']
    value_mongo2 = request.form['id2']

    # collection mongo
    online_news_hash = mongo_insert.db.online_news_hash

    # get hash1 & hash2
    compare_hash1 = online_news_hash.find_one({'_id' : value_mongo1})
    compare_hash2 = online_news_hash.find_one({'_id' : value_mongo2})

    hash1 = compare_hash1['hash']
    hash2 = compare_hash2['hash']

    dec1 = int(hash1, 16);
    dec2 = int(hash2, 16);
    bin1 = bin(dec1)
    bin2 = bin(dec2)
    xor_bin = int(bin1, 2) ^ int(bin2, 2)
    distance = bin(xor_bin).count("1")
    divider = len(hash1) * 4

    result =  1 - (distance / float(divider))

    hash_accuracy = {
        'accuracy': float(result)
    }

    return json.dumps(hash_accuracy)