" RuntimeError:thread .__ init __()未称为“；当子类化threading.Thread时 [英] " RuntimeError: thread.__init__() not called" when subclassing threading.Thread

问题描述

我需要运行与列表目录中的元素一样多的Observer类线程. 当我运行它的python控制台时，它可以正常工作.

I need to run as many threads of class Observer as there are elements in list dirlist. When I run it python console it works all right.

class Observer(Thread):
    def run(self):
        naptime = random.randint(1,10)
        print(self.name + ' starting, running for %ss.' % naptime)
        time.sleep(naptime)
        print(self.name + ' done')

observers = {}
for d in dirlist:
    observers[d] = Observer()
    observers[d].start()

但是，当我尝试从应该生成观察者线程的主线程执行此操作时，我会出错.

But when I try to do it from a Master thread which is supposed to spawn the Observer threads I get errors.

class Master(Thread):
    def __init__(self, dirlist):
        self.dirlist = dirlist
    def run(self):
        observers = {}
        for d in dirlist:
            observers[d] = Observer()
            observers[d].start()
        while True:
            time.sleep(3600)

master_thread = Master(dirlist)
master_thread.start()

对Master.start的调用导致:

RuntimeError: thread.__init__() not called

这对我来说很奇怪.
我无法理解这两种情况之间的区别.
有人可以找出解决我问题的方法吗?

This looks strange to me.
I am unable to understand whats the difference between both cases.
Can anybody figure out a solution to my problem ?

以某种方式的跟踪不会产生错误，我也不明白为什么.

Somehow following doesn't produce an error, and I don't understand why.

class Master(Thread):
    def set(self, dirlist):
        self.dirlist = dirlist
    def run(self):
        observers = {}
        for d in dirlist:
            observers[d] = Observer()
            observers[d].start()
        while True:
            time.sleep(3600)

master_thread = Master()
master_thread.set(dirlist)
master_thread.start()

推荐答案

>>> master_thread.start()
RuntimeError: thread.__init__() not called

请确保在您的Master.__init__中呼叫Thread.__init__():

class Master(Thread):
    def __init__(self, dirlist):
        super(Master, self).__init__()
        self.dirlist = dirlist

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