我在python中遇到线程问题,问题似乎是当我调用一个线程后,调用raw_input()会阻塞该线程。这是最小的例子
import threading
import time
class tread_test(threading.Thread):
def __init__(self):
self.running = True
threading.Thread.__init__(self)
#
def run(self):
self.foo()
#
def foo(self):
print "Spam, Spam, Spam"
self.task = threading.Timer(0.5, self.foo)
self.task.start()
#
def stop(self):
self.running = False
self.task.cancel()
#
#
if __name__ == "__main__":
a = tread_test()
print "Starting now"
a.start()
raw_input()
a.stop()
print "Stopping now"
我对此的期望是:
Starting now
Spam, Spam, Spam
Spam, Spam, Spam
Spam, Spam, Spam
** user hits enter **
Stopping now
这是给我的:
>>>
Starting now
Spam, Spam, Spam
** After several seconds user hits enter **
Traceback (most recent call last):
File "C:\file\test.py", line 37, in <module>
a.stop()
File "C:\file\test.py", line 28, in stop
self.task.cancel()
AttributeError: 'tread_test' object has no attribute 'task'
>>> Spam, Spam, Spam
Spam, Spam, Spam
Spam, Spam, Spam
Spam, Spam, Spam
Spam, Spam, Spam
Spam, Spam, Spam
Spam, Spam, Spam
================================ RESTART ================================
在重新启动终端之前,它一直打印出来。当我用threading.sleep()替换raw_input()命令暂停一段时间时,它按预期工作。在我看来,raw_input()以某种方式阻止foo()中的Timer执行。
为什么这不像我期望的那样工作?是因为某些原因它应该像这样工作,还是我错过了什么?
任何帮助将不胜感激。谢谢!
答案 0 :(得分:4)
您的代码看起来很好,适用于Linux和Windows。我认为你遇到了IDLE解释器的限制,它往往会出现基于multiprocessing
和threading
的代码问题。我只是建议不要尝试从IDLE中运行代码。