Python 工作线程不响应来自主线程的槽调用

对于我基于Python和Qt的项目，我想将昂贵的计算和提供服务器/客户机功能的函数转移到单独的线程中，以解冻我的GUI.在让它们运行的同时，我仍然希望它们定期判断是否有来自主线程的新数据.为了进行测试，我因此实现了以下演示代码:

import sys
from time import sleep
import shiboken6

from PySide6.QtCore import Qt, QObject, QThread, Signal, Slot, QTimer
from PySide6.QtWidgets import (
    QApplication,
    QLabel,
    QMainWindow,
    QPushButton,
    QVBoxLayout,
    QWidget,
)

class Worker(QObject):
    finished = Signal()
    progress = Signal(int)

    def __init__(self):
        super().__init__()
        self.print_to_console_plz = False

    @Slot()
    def print_on_console_while_running(self):
        self.print_to_console_plz = True
        print("Set print_to_console to true")

    def run(self):
        timer = QTimer()
        for i in range(5):
            sleep(0.9)
            timer.start(100)
            if self.print_to_console_plz:
                print("Hello World from worker")
                self.print_to_console_plz = False
            self.progress.emit(i + 1)
        self.finished.emit()

class Window(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.clicksCount = 0
        self.initWorker()
        self.setupUi()

    def initWorker(self):
        self.thread = QThread()
        # Step 3: Create a worker object
        self.worker = Worker()
        # Step 4: Move worker to the thread
        self.worker.moveToThread(self.thread)
        # Step 5: Connect signals and slots
        self.thread.started.connect(self.worker.run)
        self.worker.finished.connect(self.thread.quit)
        self.worker.finished.connect(self.worker.deleteLater)
        self.thread.finished.connect(self.thread.deleteLater)
        self.worker.progress.connect(self.reportProgress)

    def setupUi(self):
        self.setWindowTitle("Freezing GUI")
        self.resize(300, 150)
        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)
        # Create and connect widgets
        self.clicksLabel = QLabel("Counting: 0 clicks", self)
        self.clicksLabel.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
        self.stepLabel = QLabel("Long-Running Step: 0")
        self.stepLabel.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
        self.clicksToConsoleLabel = QLabel("Click here to print to console", self)
        self.clicksToConsoleLabel.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
        self.countBtn = QPushButton("Click me!", self)
        self.countBtn.clicked.connect(self.countClicks)
        self.ToConsoleBttn = QPushButton("Print to console!", self)
        self.ToConsoleBttn.clicked.connect(self.worker.print_on_console_while_running)
        self.longRunningBtn = QPushButton("Long-Running Task!", self)
        self.longRunningBtn.clicked.connect(self.runLongTask)
        # Set the layout
        layout = QVBoxLayout()
        layout.addWidget(self.clicksLabel)
        layout.addWidget(self.countBtn)
        layout.addStretch()
        layout.addWidget(self.clicksToConsoleLabel)
        layout.addWidget(self.ToConsoleBttn)
        layout.addStretch()
        layout.addWidget(self.stepLabel)
        layout.addWidget(self.longRunningBtn)
        self.centralWidget.setLayout(layout)

    def countClicks(self):
        self.clicksCount += 1
        self.clicksLabel.setText(f"Counting: {self.clicksCount} clicks")

    def reportProgress(self, n):
        self.stepLabel.setText(f"Long-Running Step: {n}")

    def runLongTask(self):
        """Long-running task in 5 steps."""
        # Step 6: Start the thread
        if not shiboken6.isValid(self.thread):
            self.initWorker()
            self.ToConsoleBttn.clicked.connect(self.worker.print_on_console_while_running)
        self.thread.start()

        # Final resets
        self.longRunningBtn.setEnabled(False)
        self.thread.finished.connect(
            lambda: self.longRunningBtn.setEnabled(True)
        )
        self.thread.finished.connect(
            lambda: self.stepLabel.setText("Long-Running Step: 0")
        )

app = QApplication(sys.argv)
win = Window()
win.show()
sys.exit(app.exec())

我的主要目的是让"昂贵"的函数在计数时在工作线程中运行，但它仍然应该定期判断是否有新数据可用(通过调用print_on_console_while_running表示).为了避免run函数在执行时阻塞所有内容，我还引入了QTimer作为非阻塞计时器.

无论如何，每当我按下"打印到控制台"按钮时当worker执行run函数时，我总是在run函数完成后打印"Set print\u to\u console to true"，而不是在执行过程中，这表明run函数仍然会阻止其他所有操作的执行.

我在这里做错了什么，如何在仍然执行run函数的情况下将数据从主线程发送到工作线程？