在函数中定义全局变量并传递给类

有人能帮忙吗, 我试图每x分钟从下面代码中定义的类PROCESS中采样一次数据(无论何时被此处未显示的其他函数调用,它都会运行) 为了进行调度,我每X分钟运行一次调度器函数,由MAIN函数启动,并由函数minmax_job执行。

然而,我的函数minmax_job似乎不知道i的初始值 我已经试了很多次放全局变量等等,但它仍然不知道I=0(最初)

i = 0
atc,otc,tssc = 0,0,0
atf,otf,tssf = False,False,False


class Process(threading.Thread):
    def __init__(self, buffer3, broadcast_server):
        threading.Thread.__init__(self)
        self.setDaemon(True)
        self.buffer3 = buffer3
        self.factory = broadcast_server

    def run(self):
        today = datetime.now()
        global time_of_last_run
        global atv1,atv2,atv3,otv1,otv2,otv3,tssv1,tssv2,tssv3
        global atf,otf,tssf
        global atc,otc,tssc


        if self.buffer3.startswith('kitchen aquarium: temp:'):
            self.temp = self.buffer3.replace('kitchen aquarium: temp:','')
            self.factory.broadcast("Aquarium temperature %s" % self.temp)

            if atc == 1 and atf:
                atv1 = float(self.temp)
                atf = False
            elif atc == 2 and atf:
                atv2 = float(self.temp)
                atf = False 
            elif atc == 3 and atf:
                atv3 = float(self.temp)
                atf = False


def minmax_job():

    global atv1,atv2,atv3,otv1,otv2,otv3,tssv1,tssv2,tssv3
    global atf,otf,tssf
    global atc,otc,tssc,i

    if i == 3:
        i = 0
        atc = 0

    if i < 4:
        atc = atc + 1 
        atf = True
        i = i + 1


if __name__ == '__main__':

    minmax_scheduler = Scheduler()
    minmax_scheduler.add_interval_job(minmax_job, seconds=10)
    minmax_scheduler.start()