python - 属性错误 : 'myThread' object has no attribute '_initialized'

Question

知道为什么我在运行下面的代码时会收到以下错误:

Traceback (most recent call last):
  File "C:\pytests\mthread1.py", line 25, in <module>
    thread1 = myThread(1, "Thread-1", 1)
  File "C:\pytests\mthread1.py", line 9, in __init__
    self.name = name
AttributeError: 'myThread' object has no attribute '_initialized'

代码:

import time
import threading

exitFlag = 0

class myThread(threading.Thread):
        def __init__(self, threadID, name, counter):
            self.threadID = threadID
            self.name = name
            self.counter = counter
            threading.Thread.__init__(self)
        def run(self):  
            print("Starting ", self.name)
            print_time(self.name, self.counter, 5)
            print("Exiting ", self.name)

def print_time(threadName, delay, counter):
    while counter:
        if exitFlag:
            thread.exit()
        time.sleep(delay)
        print("{}: {}" . format(threadName, time.ctime(time.time())))
        counter -= 1

thread1 = myThread(1, "Thread-1", 1)
thread2 = myThread(2, "Thread-2", 2)

thread1.start()         
thread2.start()         

print("Exiting Main Thread") 

Answer 1

很简单，根据documentation :

A thread has a name. The name can be passed to the constructor, and read or changed through the name attribute.

和

class threading.Thread(group=None, target=None, name=None, args=(), kwargs={})

因此，您正在尝试通过类构造函数设置一个可能期望以某种方式设置的属性。事实上，如果您检查 Thread 类' source code :

@property
def name(self):
    assert self._initialized, "Thread.__init__() not called"
    return self._name

@name.setter
def name(self, name):
    assert self._initialized, "Thread.__init__() not called"
    self._name = str(name)

所有你需要改变的 - 稍早调用 Thread.__init__(name=name):

class myThread(threading.Thread):
    def __init__(self, threadID, name, counter):
        threading.Thread.__init__(self, name=name)
        self.threadID = threadID
        self.counter = counter