Python：在特定机器上发布订阅redis通道的运行线程

我正在centos 6.5上运行这段代码。同样的代码也适用于我的另一台机器，它也有Centos 6.5。我不明白这怎么可能：

import redis
import threading
import time

# Singleton class
class Listener(threading.Thread):
    __shared_state = {}

    def __init__(self, r):
        print 'Initing listener'
        self.__dict__ = self.__shared_state
        threading.Thread.__init__(self)
        self.redis = r
        self.pubsub = self.redis.pubsub()

    def list_subscribe(self, channels):
        self.pubsub.subscribe(channels)

    def list_unsubscribe(self, channels):
        self.pubsub.unsubscribe(channels)

    def work(self, item):
        print item['channel'], ":", item['data']

    def run(self):
        print 'Running thread'
        for item in self.pubsub.listen():
            if item['data'] == "KILL":
                self.pubsub.unsubscribe()
                print self, "unsubscribed and finished"
                break
            else:
                print 'Got something'
                self.work(item)

if __name__ == "__main__":
    r = redis.Redis()
    client = Listener(r)
    client.start()
    client.list_subscribe(['test'])

    for x in range(0, 10):
        r.publish('test', 'this will reach the listener')
        time.sleep(1)

    r.publish('test', 'KILL')

我根本没看到印刷发生。我还添加了断言（未显示），我没有命中任何断言

这是我看到的输出

$ python redis_listener.py 
Initing listener
Running thread

这是从redis客户端发送的，以确认数据实际上正在发布

1425758220.317547 [0 [::1]:36491] "SUBSCRIBE" "test"
1425758220.318266 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758221.319827 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758222.321659 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758223.323464 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758224.325268 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758225.327022 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758226.328722 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758227.329919 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758228.331199 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758229.332095 [0 [::1]:36492] "PUBLISH" "test" "this will reach the listener"
1425758230.333751 [0 [::1]:36492] "PUBLISH" "test" "KILL"

同一代码怎么可能在一台机器上工作而在另一台机器上不工作

这是它“工作”的机器的输出

初始化侦听器
螺纹
有东西吗
测试：1
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
有东西吗
测试：这将到达侦听器
取消订阅并完成

Initing listener
Running thread
Got something
test : 1
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
Got something
test : this will reach the listener
<Listener(Thread-1, started 139825429100288)> unsubscribed and finished