def _calc_prob(num, datas):
    """
    计算num在datas里的概率
    e.g.:
        num = 1
        data = [[2,3],[1,7],[3,6]]
        retunr 1/3
    """
    match = 0
    for data in datas:
        if num in data:
            match += 1
    # match/len(datas)
    return round(match/len(datas)*100)