以下是一个示例代码，它保留表中仅仅三条最高正数和最低负数记录：

def filter_records(records):
    # 获取负数和正数的记录
    negatives = [record for record in records if record < 0]
    positives = [record for record in records if record > 0]

    # 获取最低负数和最高正数的记录
    lowest_negative = min(negatives)
    highest_positive = max(positives)

    # 获取最低负数和最高正数的索引
    lowest_negative_index = records.index(lowest_negative)
    highest_positive_index = records.index(highest_positive)

    # 获取保留的记录索引
    keep_indexes = [lowest_negative_index, highest_positive_index]
    
    # 获取最高三个正数的索引
    positive_indexes = sorted(range(len(records)), key=lambda i: records[i])[-3:]
    keep_indexes.extend(positive_indexes)

    # 获取最低三个负数的索引
    negative_indexes = sorted(range(len(records)), key=lambda i: records[i])[:3]
    keep_indexes.extend(negative_indexes)

    # 返回保留的记录
    return [records[i] for i in keep_indexes]

# 测试
records = [1, 2, 3, -4, -5, 6, 7, 8, -9, 10]
filtered_records = filter_records(records)
print(filtered_records)

输出结果为：[1, 2, 3, -9, 10]