Python定时任务随机时间执行的实现方法
背景:
有一个爬虫服务,需要定时从公开网站上拉取一些数据,为了避免被识别为爬虫(防爬虫的识别需要根据很多特征,时间仅仅是其中一个维度),需要在指定的时间内,随机生成一个时间爬取
脚本是python写的,直接上代码...
import logging import traceback from datetime import datetime from apscheduler.schedulers.background import BackgroundScheduler scheduler = BackgroundScheduler() def spider_schedule(): # spider_schedule是job_id scheduler.remove_job('spider_schedule') try: print 'spider start... ', datetime.now().strftime('%Y-%m-%d %X') #--------自己的业务代码------- pass #--------------------------- print 'spider end... ', datetime.now().strftime('%Y-%m-%d %X') except Exception as e: print traceback.format_exc(e) finally: interval_minutes = random.randint(60, 120) # 1-120分钟随机选一个时间 interval_seconds = random.randint(1, 60) # 1~60秒随机选一个时间 scheduler.add_job(spider_schedule, 'interval', minutes=interval_minutes, seconds=interval_seconds, id='spider_schedule') if __name__ == '__main__': scheduler.add_job(spider_schedule, 'interval', seconds=10, id='spider_schedule') scheduler.start()
ps:下面看下python定时执行任务的三种方式
#!/user/bin/env python # @Time :2018/6/7 16:31 # @Author :PGIDYSQ #@File :PerformTaskTimer.py #定时执行任务命令 #1.定时任务代码 import time,os,sched # schedule = sched.scheduler(time.time,time.sleep) # def perform_command(cmd,inc): # os.system(cmd) # print('task') # def timming_exe(cmd,inc=60): # schedule.enter(inc,0,perform_command,(cmd,inc)) # schedule.run() # print('show time after 2 seconds:') # timming_exe('echo %time%',2) #2.周期性执行任务 schedule = sched.scheduler(time.time,time.sleep) def perform_command(cmd,inc): #在inc秒后再次运行自己,即周期运行 schedule.enter(inc, 0, perform_command, (cmd, inc)) os.system(cmd) def timming_exe(cmd,inc=60): schedule.enter(inc,0,perform_command,(cmd,inc)) schedule.run()#持续运行,直到计划时间队列变成空为止 print('show time after 2 seconds:') timming_exe('echo %time%',2) #3.循环执行命令 # import time,os # def re_exe(cmd,inc = 60): # while True: # os.system(cmd) # time.sleep(inc) # re_exe("echo %time%",5)
赞 (0)