Python中是否有Scheduled Executor服務？

Question

一個python新手問題。在python中是否有與Java的Scheduled executor服務相當的功能？

Answer 1

我的快速研究表明，Java的Scheduled Executor允許延遲或定期運行命令（http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/ScheduledExecutorService.html）。

Python沒有任何標準庫來處理週期執行，但sched模塊可以在指定的延遲後執行的任務：http://docs.python.org/2/library/sched.html

類似的問題在這裏問週期性事件：Schedule a repeating event in Python 3（Python 3中，雖然）。

Answer 2

不是threading.timer做你想做的？

def hello(): 
    print "hello, world" 

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

編輯新增可重複的例子。

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 3

有趣的是，我看到這個github上包讀你的問題之前幾分鐘：

：自述採取

Python job scheduling for humans.

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) 

你可能想給它一個鏡頭：

$ pip install schedule