@staticmethod
def _sec2str(s):
    """ 将秒数转化为 ddhddmdds 的格式"""
    s = int(s)
    m = int((s - s % 60) / 60)
    h = int((m - m % 60) / 60)
    s = s % 60
    if m == 0 and h == 0:
        return '{:02d}s'.format(s)
    if h == 0:
        return '{:02d}m{:02d}s'.format(m, s)
    return '{:02d}h{:02d}m{:02d}s'.format(h, m, s)
