Python 使用moveToThread在PyQt5中启动QThreads。一个线程无法正常启动

在下面的（半）工作示例中，我有4个工作线程。我只能使前三个辅助线程工作。如何运行第四个线程

print（QThread.idealThreadCount（））

在我的笔记本电脑上返回“8”

我可以对代码进行重新排序，以使3个worker的任意组合都能运行

from PyQt5.QtCore import QThread, QObject
from PyQt5.QtWidgets import QWidget
import sys
from PyQt5.QtWidgets import QApplication
import time

class A(QObject):
    def run(self):
        while 1:
            print('A', time.ctime())
            time.sleep(1)
class B(QObject):
    def run(self):
        while 1:
            print('B', time.ctime())
            time.sleep(1)
class C(QObject):
    def run(self):
        while 1:
            print('C', time.ctime())
            time.sleep(1)
class D(QObject):
    def run(self):
        while 1:
            print('D', time.ctime())
            time.sleep(1)

class window1(QWidget):
    def __init__ (self, parent = None):
        super().__init__ () #parent widget
        print(QThread.idealThreadCount())

        self.thread1 = QThread()
        obj1 = A()
        obj1.moveToThread(self.thread1)
        self.thread1.started.connect(obj1.run)
        self.thread1.start()

        self.thread2 = QThread()
        obj2 = B()
        obj2.moveToThread(self.thread2)
        self.thread2.started.connect(obj2.run) 
        self.thread2.start()

        self.thread3 = QThread()
        obj3 = C()
        obj3.moveToThread(self.thread3)
        self.thread3.started.connect(obj3.run)
        self.thread3.start()

        self.thread4 = QThread()
        obj4 = D()
        obj4.moveToThread(self.thread4)
        self.thread4.started.connect(obj4.run)
        self.thread4.start()

app = QApplication(sys.argv) 
w = window1()
w.show()
sys.exit(app.exec_())

---

我发现如果我在

\uuuu init\uuuu

方法的垂直端添加

time.sleep（1）

延迟，那么所有线程现在都可以工作了

不过，我想了解原因。如果有更好的答案，我们将不胜感激

from PyQt5.QtCore import QThread, QObject
from PyQt5.QtWidgets import QWidget, QApplication
import sys
import time

class A(QObject):
    def run(self):
        while 1:
            print('A', time.ctime())
            time.sleep(1)
class B(QObject):
    def run(self):
        while 1:
            print('B', time.ctime())
            time.sleep(1)
class C(QObject):
    def run(self):
        while 1:
            print('C', time.ctime())
            time.sleep(1)
class D(QObject):
    def run(self):
        while 1:
            print('D', time.ctime())
            time.sleep(1)

class window1(QWidget):
    def __init__ (self, parent = None):
        super().__init__ () #parent widget

        self.thread1 = QThread()
        obj1 = A()
        obj1.moveToThread(self.thread1)
        self.thread1.started.connect(obj1.run)
        self.thread1.start()

        self.thread2 = QThread()
        obj2 = B()
        obj2.moveToThread(self.thread2)
        self.thread2.started.connect(obj2.run) #this sets up a signal in the other direction??
        self.thread2.start()

        self.thread3 = QThread()
        obj3 = C()
        obj3.moveToThread(self.thread3)
        self.thread3.started.connect(obj3.run) #this sets up a signal in the other direction??
        self.thread3.start()

        self.thread4 = QThread()
        obj4 = D()
        obj4.moveToThread(self.thread4)
        self.thread4.started.connect(obj4.run)
        self.thread4.start()

        time.sleep(1)

app = QApplication(sys.argv) #every pyqt application must create an application object
w = window1()
w.show()
sys.exit(app.exec_())

---

您没有存储对

obj1

、

obj2

等的引用。因为它们没有父对象（使用

moveToThread

需要父对象），所以它们在

\uuu init\uuuu

方法末尾被垃圾收集。您添加的

time.sleep（1）

只会延迟

\uuuu init\uuu

方法和垃圾收集的结束

---

如果存储对对象的引用（例如

self.obj1=…

），则所有线程都应正确运行。

但是如果我有许多线程，在将它们存储在诸如self之类的列表中之后。\u线程，我如何在它们完成后删除它们？@Shuman。这不是一个真正可以扩展的地方，答案可能取决于你的具体情况。