python - Python 中有计划的执行器服务吗？

Question

一个python新手问题。python中是否有等效于Java的Scheduled executor服务？

Answer 1

threading.timer不做你想做的事吗？

def hello():
    print "hello, world"

t = Timer(30.0, hello)
t.start() # after 30 seconds, "hello, world" will be printed

编辑添加了可重复的示例。

import threading
import time

def repeat_every(n, func, *args, **kwargs):
    def and_again():
        func(*args, **kwargs)
        t = threading.Timer(n, and_again)
        t.daemon = True
        t.start()
    t = threading.Timer(n, and_again)
    t.daemon = True
    t.start()


def scheduled_task(msg='hello, world', **kwargs):
    print time.time(), "scheduled_task:", msg, kwargs

repeat_every(.5, scheduled_task )
repeat_every(1, scheduled_task, "Slow", name="Hand luke")

for x in range(5):
    print time.time(), "Main: busy as a bee."
    time.sleep(3)

生成：

 1360662042.34 Main: busy as a bee.
1360662042.84 scheduled_task: hello, world {}
1360662043.34 scheduled_task: Slow {'name': 'Hand luke'}
1360662043.34 scheduled_task: hello, world {}
1360662043.84 scheduled_task: hello, world {}
1360662044.34 scheduled_task: Slow {'name': 'Hand luke'}
1360662044.34 scheduled_task: hello, world {}
1360662044.84 scheduled_task: hello, world {}
1360662045.34 Main: busy as a bee.
1360662045.34 scheduled_task: Slow {'name': 'Hand luke'}
1360662045.34 scheduled_task: hello, world {}
1360662045.85 scheduled_task: hello, world {}
1360662046.34 scheduled_task: Slow {'name': 'Hand luke'}
1360662046.35 scheduled_task: hello, world {}
1360662046.85 scheduled_task: hello, world {}
1360662047.34 scheduled_task: Slow {'name': 'Hand luke'}
1360662047.35 scheduled_task: hello, world {}
1360662047.85 scheduled_task: hello, world {}
1360662048.34 Main: busy as a bee.
1360662048.34 scheduled_task: Slow {'name': 'Hand luke'}
1360662048.35 scheduled_task: hello, world {}
1360662048.85 scheduled_task: hello, world {}
1360662049.35 scheduled_task: Slow {'name': 'Hand luke'}
1360662049.35 scheduled_task: hello, world {}
1360662049.86 scheduled_task: hello, world {}
1360662050.35 scheduled_task: Slow {'name': 'Hand luke'}
1360662050.36 scheduled_task: hello, world {}
1360662050.86 scheduled_task: hello, world {}
1360662051.34 Main: busy as a bee.
1360662051.35 scheduled_task: Slow {'name': 'Hand luke'}
1360662051.36 scheduled_task: hello, world {}
1360662051.86 scheduled_task: hello, world {}
1360662052.35 scheduled_task: Slow {'name': 'Hand luke'}
1360662052.36 scheduled_task: hello, world {}
1360662052.86 scheduled_task: hello, world {}
1360662053.35 scheduled_task: Slow {'name': 'Hand luke'}
1360662053.36 scheduled_task: hello, world {}
1360662053.86 scheduled_task: hello, world {}
1360662054.34 Main: busy as a bee.
1360662054.35 scheduled_task: Slow {'name': 'Hand luke'}
1360662054.37 scheduled_task: hello, world {}
1360662054.87 scheduled_task: hello, world {}
1360662055.36 scheduled_task: Slow {'name': 'Hand luke'}
1360662055.37 scheduled_task: hello, world {}
1360662055.87 scheduled_task: hello, world {}
1360662056.36 scheduled_task: Slow {'name': 'Hand luke'}
1360662056.37 scheduled_task: hello, world {}
1360662056.87 scheduled_task: hello, world {}

Answer 2

我的快速研究表明，Java 的 Scheduled Executor 允许在延迟后或定期运行命令（http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/ScheduledExecutorService.html）。

Python 在标准库中没有任何东西可以处理定期执行，但sched模块可以在指定的延迟后执行任务：http: //docs.python.org/2/library/sched.html

这里问了一个关于周期性事件的类似问题：在 Python 3 中安排重复事件（不过是 Python 3）。

Answer 3

有趣的是，在阅读您的问题前几分钟，我看到了这个 github 包：

人类的 Python 作业调度。

摘自自述文件的示例：

import schedule

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

schedule.every(10).minutes.do(job)
schedule.every().hour.do(job)
schedule.every().day.at("10:30").do(job)

while 1:
    schedule.run_pending()
    time.sleep(1)

您可能想试一试：

$ pip install schedule