即使在删除Thread对象后，QThread也作为Dummy Thread运行

Question

即使在删除Thread对象后，QThread似乎也在后台运行。我用this example来证明我面临的问题。线程一直处于活动状态[当它运行，完成和删除时]

请参阅以下代码

from PyQt4.QtCore import QThread, QTimer,QObject, pyqtSignal, pyqtSlot, Qt
from PyQt4.QtGui import QApplication, QLabel, QWidget, QGridLayout
import sys
import time
import threading
import sip

def activeThreads():            
    currentThread = threading.current_thread()
    print("Current Thread=",currentThread)
    n = 0
    for td in threading.enumerate():
        if td is not currentThread:
            print("Thread = ",td)

class Worker(QObject):
    finished = pyqtSignal()
    intReady = pyqtSignal(int)

    def __init__(self, maxCount):
        super().__init__()
        self.maxCount=maxCount

    @pyqtSlot()
    def procCounter(self): # A slot takes no params
        for i in range(1, self.maxCount):
            time.sleep(0.5)
            self.intReady.emit(i)
        print("Called from worker thread")
        activeThreads()
        self.finished.emit()

class Form(QWidget):
    def __init__(self):
        super().__init__()
        self.label = QLabel("0")

        # 1 - create Worker and Thread inside the Form
        self.obj = Worker(6)  # no parent!
        self.thread = QThread()  # no parent!

        # 2 - Connect Worker`s Signals to Form method slots to post data.
        self.obj.intReady.connect(self.onIntReady)

        # 3 - Move the Worker object to the Thread object
        self.obj.moveToThread(self.thread)

        # 4 - Connect Worker Signals to the Thread slots
        #self.obj.finished.connect(self.thread.quit)
        self.obj.finished.connect(self.quitThread)

        # 5 - Connect Thread started signal to Worker operational slot method
        self.thread.started.connect(self.obj.procCounter)

        # 6 - Start the thread
        self.thread.start()

        # 7 - Start the form
        self.initUI()

    def quitThread(self):
        self.thread.quit()
        #self.obj.deleteLater()
        self.checkThread()

    def checkThread(self):
        try:
            self.thread.objectName()
        except RuntimeError as err:
            print("-----------------------------------------------------------")
            print("Error=",err)
            print("After Worker thread object deleted")
            activeThreads()
            return
        if self.thread.isRunning():
            #print("Still running")
            QTimer.singleShot(1, self.checkThread)
            #activeThreads()
        if self.thread.isFinished():
            print("-----------------------------------------------------------")
            print("After worker thread finished")
            activeThreads()
            self.obj.deleteLater()
            self.thread.deleteLater()
            QTimer.singleShot(1, self.checkThread)

    def initUI(self):
        grid = QGridLayout()
        self.setLayout(grid)
        grid.addWidget(self.label,0,0)

        self.move(300, 150)
        self.setWindowTitle('thread test')
        self.show()

    def onIntReady(self, i):
        self.label.setText("{}".format(i))

app = QApplication(sys.argv)

form = Form()

sys.exit(app.exec_())

这是输出

Called from worker thread  
Current Thread= <_DummyThread(Dummy-1,started daemon 6692)  
Thread =  <_MainThread(MainThread, started 10204)
-----------------------------------------------------------  
After worker thread finished  
Current Thread= <_MainThread(MainThread,started 10204)>  
Thread =  <_DummyThread(Dummy-1, started daemon 6692)>
-----------------------------------------------------------  
Error= wrapped C/C++ object of type QThread has been deleted  
After Worker thread object deleted  
Current Thread= <_MainThread(MainThread, started 10204) 
Thread =  <_DummyThread(Dummy-1, started daemon 6692)>

我是以正确的方式使用它吗？如果我在这里错过了什么，请告诉我。

P.S：可以理解，无论我们是否设置了对象名称，Python都会将其命名为＆＃34; Dummy-1,2＆＃34;因为它不是使用线程模块创建的。