python实现定时器的5种方法

# -*- coding:utf-8 -*-
import threading
import time
cancel_tmr = False
def start():
	#具体任务执行内容
    print("hello world")

def heart_beat():
	# 打印当前时间
    print(time.strftime('%Y-%m-%d %H:%M:%S'))
    if not cancel_tmr:
        start()
        # 每隔3秒执行一次
        threading.Timer(3, heart_beat).start()
if __name__ == '__main__':
    heart_beat()
    # 15秒后停止定时器
    time.sleep(15)
    cancel_tmr = True

# -*- coding:utf-8 -*-
import threading
import time
exec_count = 0
def start():
    print("hello world", exec_count)
def heart_beat():
    print(time.strftime('%Y-%m-%d %H:%M:%S'))
    global exec_count
    exec_count += 1
    # 执行15次后停止定时器
    if exec_count < 15:
        start()
        threading.Timer(5, heart_beat).start()
if __name__ == '__main__':
    heart_beat()

# -*- coding:utf-8 -*-
import datetime
import threading

def func():
    print("haha")
    # 如果需要循环调用，就要添加以下方法
    timer = threading.Timer(86400, func)
    timer.start()

# 获取现在时间
now_time = datetime.datetime.now()
# 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
# print(next_time, next_year, next_month, next_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")
# print(next_time)
# # 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
# 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()

# !/usr/bin/env python
# -*- coding:utf-8 -*-
import schedule
import time

def job(text=""):
    print(text, "I'm working...")

schedule.every().seconds.do(job, "每秒一次")
schedule.every(5).seconds.do(job, "五秒一次")
schedule.every(10).minutes.do(job, "10分钟一次")
schedule.every().hour.do(job, "1小时一次")
# 每天10:30执行
schedule.every().day.at("10:30").do(job)
# 每隔5到10天执行一次任务 
schedule.every(5).to(10).days.do(job)
# 每周一的这个时候执行一次任务
schedule.every().monday.do(job)
# 每周三13:15执行一次任务
schedule.every().wednesday.at("13:15").do(job)

while True:
	# run_pending：运行所有可以运行的任务
    schedule.run_pending()
    time.sleep(1)

# -*- coding:utf-8 -*-
import schedule
import time
def job():
    print("I'm working... in job1  start")
    time.sleep(5)
    print("I'm working... in job1  end")

def job2():
    print("I'm working... in job2")

schedule.every(3).seconds.do(job)
schedule.every(3).seconds.do(job2)
while True:
    schedule.run_pending()
    time.sleep(1)

# -*- coding:utf-8 -*-
import datetime
import schedule
import threading
import time

def job1():
    print("I'm working for job1 start", datetime.datetime.now())
    time.sleep(5)
    print("job1: end", datetime.datetime.now())

def job2():
    print("I'm working for job2 start", datetime.datetime.now())
    time.sleep(3)
    print("job2: end", datetime.datetime.now())

def job1_task():
    threading.Thread(target=job1).start()

def job2_task():
    threading.Thread(target=job2).start()

def run():
    schedule.every(3).seconds.do(job1_task)
    schedule.every(3).seconds.do(job2_task)

    while True:
        schedule.run_pending()
        time.sleep(1)
if __name__ == '__main__':
    run()

# -*- coding:utf-8 -*-
import time
import datetime
from apscheduler.schedulers.blocking import BlockingScheduler

def my_job(text="默认值"):
    print(text, time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

sched = BlockingScheduler()
sched.add_job(my_job, 'interval', seconds=3, args=['3秒定时'])
# 2018-3-17 00:00:00 执行一次，args传递一个text参数
sched.add_job(my_job, 'date', run_date=datetime.date(2019, 10, 17), args=['根据年月日定时执行'])
# 2018-3-17 13:46:00 执行一次，args传递一个text参数
sched.add_job(my_job, 'date', run_date=datetime.datetime(2019, 10, 17, 14, 10, 0), args=['根据年月日时分秒定时执行'])
# sched.start()
"""
interval 间隔调度，参数如下：
    weeks (int) – 间隔几周
    days (int) – 间隔几天
    hours (int) – 间隔几小时
    minutes (int) – 间隔几分钟
    seconds (int) – 间隔多少秒
    start_date (datetime|str) – 开始日期
    end_date (datetime|str) – 结束日期
    timezone (datetime.tzinfo|str) – 时区
"""
"""
cron参数如下：
    year (int|str) – 年，4位数字
    month (int|str) – 月 (范围1-12)
    day (int|str) – 日 (范围1-31)
    week (int|str) – 周 (范围1-53)
    day_of_week (int|str) – 周内第几天或者星期几 (范围0-6 或者 mon,tue,wed,thu,fri,sat,sun)
    hour (int|str) – 时 (范围0-23)
    minute (int|str) – 分 (范围0-59)
    second (int|str) – 秒 (范围0-59)
    start_date (datetime|str) – 最早开始日期(包含)
    end_date (datetime|str) – 最晚结束时间(包含)
    timezone (datetime.tzinfo|str) – 指定时区
"""
# my_job将会在6,7,8,11,12月的第3个周五的1,2,3点运行
sched.add_job(my_job, 'cron', month='6-8,11-12', day='3rd fri', hour='0-3')
# 截止到2018-12-30 00:00:00，每周一到周五早上五点半运行job_function
sched.add_job(my_job, 'cron', day_of_week='mon-fri', hour=5, minute=30, end_date='2018-12-31')

# 表示2017年3月22日17时19分07秒执行该程序
sched.add_job(my_job, 'cron', year=2017, month=3, day=22, hour=17, minute=19, second=7)

# 表示任务在6,7,8,11,12月份的第三个星期五的00:00,01:00,02:00,03:00 执行该程序
sched.add_job(my_job, 'cron', month='6-8,11-12', day='3rd fri', hour='0-3')

# 表示从星期一到星期五5:30（AM）直到2014-05-30 00:00:00
sched.add_job(my_job, 'cron', day_of_week='mon-fri', hour=5, minute=30, end_date='2014-05-30')

# 表示每5秒执行该程序一次，相当于interval 间隔调度中seconds = 5
sched.add_job(my_job, 'cron', second='*/5', args=['5秒定时'])
sched.start()