class ChanMACDHistSet():
    def __init__(self, start_time, start_klu, pre_histset, dir):
        self.start_time = start_time
        self.end_time = None
        self.klu_list = []
        self.klu_list.append(start_klu)
        self.ref_klu = None
        self.histset_dir = dir
        self.next = None
        self.pre = pre_histset
    def set_next(self, next_histset):
        self.next = next_histset
    def add_klu(self, klu):
        self.klu_list.append(klu)
        klu.set_histset(self)
    def set_end_klu(self, end_klu):
        self.end_klu = end_klu
        self.end_time = end_klu.time