[英]Correct way to do timer function in Python
I have a GUI application that needs to do something simple in the background (update a wx python progress bar, but that doesn't really matter). 我有一个GUI应用程序,需要在后台做一些简单的事情(更新wx python进度条,但这并不重要)。 I see that there is a threading.timer class.. but there seems to be no way to make it repeat.
我看到有一个threading.timer类。但是似乎没有办法使它重复。 So if I use the timer, I end up having to make a new thread on every single execution... like :
因此,如果使用计时器,则最终必须在每次执行时都创建一个新线程……
import threading
import time
def DoTheDew():
print "I did it"
t = threading.Timer(1, function=DoTheDew)
t.daemon = True
t.start()
if __name__ == '__main__':
t = threading.Timer(1, function=DoTheDew)
t.daemon = True
t.start()
time.sleep(10)
This seems like I am making a bunch of threads that do 1 silly thing and die.. why not write it as : 好像我在做一堆线程,这些线程会做1愚蠢的事而死..为什么不这样写:
import threading
import time
def DoTheDew():
while True:
print "I did it"
time.sleep(1)
if __name__ == '__main__':
t = threading.Thread(target=DoTheDew)
t.daemon = True
t.start()
time.sleep(10)
Am I missing some way to make a timer keep doing something? 我是否缺少使计时器继续执行某些操作的方法? Either of these options seems silly... I am looking for a timer more like a java.util.Timer that can schedule the thread to happen every second... If there isn't a way in Python, which of my above methods is better and why?
这些选项中的任何一个似乎都是愚蠢的...我正在寻找一个更像java.util.Timer的计时器,该计时器可以安排线程每秒发生一次...如果Python中没有办法,那么我上面的哪种方法更好,为什么?
A pattern more like this is probably what you should be doing, but it's hard to say because you didn't provide many details. 像这样的模式可能是您应该做的,但是很难说,因为您没有提供很多细节。
def do_background_work(self):
# do work on a background thread, posting updates to the
# GUI thread with CallAfter
while True:
# do stuff
wx.CallAfter(self.update_progress, percent_complete)
def update_progress(self, percent_complete):
# update the progress bar from the GUI thread
self.gauge.SetValue(percent_complete)
def on_start_button(self, event):
# start doing background work when the user hits a button
thread = threading.Thread(target=self.do_background_work)
thread.setDaemon(True)
thread.start()
wxwindows has its own timer . wxwindows有其自己的计时器 。 It supports one shot, and reoccurring events.
它支持一次拍摄和重复发生的事件。
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