python定时器

1、指定时间，每天定时运行

def func():
    main_fun() ##主要的函数
    #如果需要循环调用，就要添加以下方法
    timer = threading.Timer(86400, func)
    #timer = threading.Timer(180, func)
    timer.start()



if __name__ == '__main__':
    spmcs_conn = cx_Oracle.connect('%s','nbadv','%s',encoding = "UTF-8",nencoding = "UTF-8")
    cur = spmcs_conn.cursor()
    now_time = datetime.datetime.now()
    now_day = now_time.date().day
    # 获取明天时间
    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
    # 获取明天3点时间
    #next_time = datetime.datetime.strptime(str(next_year)+"-"+str(next_month)+"-"+str(next_day)+" 03:00:00", "%Y-%m-%d %H:%M:%S")
    next_time = datetime.datetime.strptime(str(next_year)+"-"+str(next_month)+"-"+str(next_day)+" 07:00:00", "%Y-%m-%d %H:%M:%S")
    # # 获取昨天时间
    # last_time = now_time + datetime.timedelta(days=-1)
    
    # 获取距离明天3点时间，单位为秒
    timer_start_time = (next_time - now_time).total_seconds()
    #print(timer_start_time)
    # 54186.75975
    #if timer_start_time >= 0:
    
    
    #定时器,参数为(多少时间后执行，单位为秒，执行的方法)
    timer = threading.Timer(timer_start_time, func)
    timer.start()

　2、隔一定时间运行程序

import datetime
import time
 
def doSth():
    # 把爬虫程序放在这个类里
    print(u'这个程序要开始疯狂的运转啦')
 
# 一般网站都是1:00点更新数据，所以每天凌晨一点启动
def main(h=1,m=0):
    while True:
        now = datetime.datetime.now()
        # print(now.hour, now.minute)
        if now.hour == h and now.minute == m:
            doSth()
        # 每隔60秒检测一次
        time.sleep(60)
    
 
main()

　

import time
from apscheduler.schedulers.background import BackgroundScheduler


def job():
    print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))


if __name__ == '__main__':
    # BackgroundScheduler: 适合于要求任何在程序后台运行的情况，当希望调度器在应用后台执行时使用
    scheduler = BackgroundScheduler()
    # 采用非阻塞的方式

    # 采用corn的方式
    scheduler.add_job(job, 'cron', day_of_week='fri', second='*/5')
    '''
    year (int|str) – 4-digit year
    month (int|str) – month (1-12)
    day (int|str) – day of the (1-31)
    week (int|str) – ISO week (1-53)
    day_of_week (int|str) – number or name of weekday (0-6 or mon,tue,wed,thu,fri,sat,sun)
    hour (int|str) – hour (0-23)
    minute (int|str) – minute (0-59)
    econd (int|str) – second (0-59)
            
    start_date (datetime|str) – earliest possible date/time to trigger on (inclusive)
    end_date (datetime|str) – latest possible date/time to trigger on (inclusive)
    timezone (datetime.tzinfo|str) – time zone to use for the date/time calculations (defaults to scheduler timezone)
        
    *    any    Fire on every value
    */a    any    Fire every a values, starting from the minimum
    a-b    any    Fire on any value within the a-b range (a must be smaller than b)
    a-b/c    any    Fire every c values within the a-b range
    xth y    day    Fire on the x -th occurrence of weekday y within the month
    last x    day    Fire on the last occurrence of weekday x within the month
    last    day    Fire on the last day within the month
    x,y,z    any    Fire on any matching expression; can combine any number of any of the above expressions
    '''
    scheduler.start()
    
    # 其他任务是独立的线程
    while True:
        print('main-start:', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))
        time.sleep(2)
        print('main-end:', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

　　##https://www.jianshu.com/p/b77d934cc252

上面的链接里讲述了很多定时器

from apscheduler.schedulers.blocking import BlockingScheduler
from datetime import datetime
def job():
    print(datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
scheduler = BlockingScheduler()
scheduler.add_job(job,"cron",hour ='8',minute= '59')
scheduler.start()