是否有一种方法，例如，打印Hello World!每n秒? 例如，程序将遍历我所拥有的任何代码，然后在5秒后(使用time.sleep())执行该代码。我会用这个来更新文件，而不是打印Hello World。
例如:
startrepeat("print('Hello World')", .01) # Repeats print('Hello World') ever .01 seconds
for i in range(5):
print(i)
>> Hello World!
>> 0
>> 1
>> 2
>> Hello World!
>> 3
>> Hello World!
>> 4
当前回答
为自己省下一次精神分裂发作，使用高级Python调度器: http://pythonhosted.org/APScheduler
代码非常简单:
from apscheduler.scheduler import Scheduler
sched = Scheduler()
sched.start()
def some_job():
print "Every 10 seconds"
sched.add_interval_job(some_job, seconds = 10)
....
sched.shutdown()
其他回答
下面是一个不需要每n秒创建一个新线程的版本:
from threading import Event, Thread
def call_repeatedly(interval, func, *args):
stopped = Event()
def loop():
while not stopped.wait(interval): # the first call is in `interval` secs
func(*args)
Thread(target=loop).start()
return stopped.set
该事件用于停止重复:
cancel_future_calls = call_repeatedly(5, print, "Hello, World")
# do something else here...
cancel_future_calls() # stop future calls
请参见改进setInterval python的当前实现
为自己省下一次精神分裂发作，使用高级Python调度器: http://pythonhosted.org/APScheduler
代码非常简单:
from apscheduler.scheduler import Scheduler
sched = Scheduler()
sched.start()
def some_job():
print "Every 10 seconds"
sched.add_interval_job(some_job, seconds = 10)
....
sched.shutdown()
我对这个主题的拙见，是Alex Martelli的答案的概括，使用start()和stop()控件:
from threading import Timer
class RepeatedTimer(object):
def __init__(self, interval, function, *args, **kwargs):
self._timer = None
self.interval = interval
self.function = function
self.args = args
self.kwargs = kwargs
self.is_running = False
self.start()
def _run(self):
self.is_running = False
self.start()
self.function(*self.args, **self.kwargs)
def start(self):
if not self.is_running:
self._timer = Timer(self.interval, self._run)
self._timer.start()
self.is_running = True
def stop(self):
self._timer.cancel()
self.is_running = False
用法:
from time import sleep
def hello(name):
print "Hello %s!" % name
print "starting..."
rt = RepeatedTimer(1, hello, "World") # it auto-starts, no need of rt.start()
try:
sleep(5) # your long-running job goes here...
finally:
rt.stop() # better in a try/finally block to make sure the program ends!
特点:
只有标准库，没有外部依赖 即使计时器已经启动/停止，也可以安全地多次调用Start()和stop() 要调用的函数可以有位置参数和命名参数 您可以随时更改间隔，它将在下次运行后生效。args、kwargs甚至function也一样!
import threading
def printit():
threading.Timer(5.0, printit).start()
print "Hello, World!"
printit()
# continue with the rest of your code
https://docs.python.org/3/library/threading.html#timer-objects
你可以启动一个单独的线程，它的唯一职责是数5秒，更新文件，重复。您不希望这个单独的线程干扰主线程。
