导读 Python 是一个高层次的结合了解释性、编译性、互动性和面向对象的脚本语言。
Python 的设计具有很强的可读性,相比其他语言经常使用英文关键字,其他语言的一些标点符号,它具有比其他语言更有特色语法结构。
使用threading写的一个定时器任务demo:
import time
import sys
import signal
import datetime
import threading
#定时器
def schedule_update():
    t = threading.Timer(0, event_func)
    t.setDaemon(True)
    t.start()
#执行函数
def event_func():
    now_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    print(now_time)
    exec_update()
    #update_openvas_dbs_from_cache()
    interval_time = delay_time()
    t = threading.Timer(interval_time, event_func)
    t.setDaemon(True)
    t.start()
#取时间点
def delay_time():
    # now time
    now_time = datetime.datetime.now()
    # tomorrow time
    next_time = now_time + datetime.timedelta(days=+1)
    next_year = next_time.date().year
    next_month = next_time.date().month
    next_day = next_time.date().day
    # get tomorrow 00:00
    next_time = datetime.datetime.strptime(str(next_year)+"-"+str(next_month)+"-"+str(next_day)+" 00:00:00", "%Y-%m-%d %H:%M:%S")

    # get secondes
    delay_time = (next_time - now_time).total_seconds()
    return delay_time

def quit_sys(signum, frame):
    sys.exit()
#接收C
if __name__ == "__main__":
    try:
        signal.signal(signal.SIGINT, quit_sys)
        signal.signal(signal.SIGTERM, quit_sys)
        schedule_update()
        print("schedule_update server starting up...\nHit Ctrl-C to quit.\n")
        while 1:
            time.sleep(1)
    except  Exception as e:
        print(e)

原文来自:https://www.linuxidc.com/Linux/2019-09/160795.htm

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