PyQt5实现线程解决UI冻结问题求助

大家好！我正在做一个简单的PyQt5应用，功能是通过SNMP和SSH连接远程主机，在上面安装软件包。流程很简单：用户输入IP地址，点开始按钮，程序就自动跑起来了。

目前功能是正常的，但有个头疼的问题——执行start_process函数的时候，UI会直接冻结，尤其是到status_copy那部分的时候。我知道这是因为耗时操作没放在线程里，但自己尝试实现线程后踩了一堆坑，现在实在搞不定了，想请教大家怎么解决！

先贴一下我写的线程相关代码：

class WorkerThread(QtCore.QThread):
    def run(self):
        start_process(ui)

def test_thread(ui):
    ui.button_start.setEnabled(False)
    ui.thread = QtCore.QThread()
    ui.worker = WorkerThread()
    ui.worker.moveToThread(ui.thread)
    ui.thread.started.connect(ui.worker.run)
    ui.worker.finished.connect(ui.thread.quit)
    ui.worker.finished.connect(ui.worker.deleteLater)
    ui.thread.finished.connect(ui.thread.deleteLater)
    ui.thread.start()

然后是主脚本的核心部分（提前说明下，start_process函数写得有点乱，还没来得及整理，见谅）：

def set_ui (ui):
    # Menubar behavior
    ui.action_exit.triggered.connect(sys.exit)

    # Screenshot View Behavior
    position = ui.gridLayout.getItemPosition(ui.gridLayout.indexOf(ui.screenshot_view))
    ui.screenshot_view = QWebEngineView(ui.centralwidget)
    ui.gridLayout.addWidget(ui.screenshot_view, position[0], position[1], position[2], position[3])

    # Button behavior
    ui.button_start.setEnabled(False)
    ui.button_screenshot.setEnabled(False)
    ui.button_reboot.setEnabled(False)
    # ui.button_start.clicked.connect(lambda x : start_process(ui))
    ui.button_start.clicked.connect(lambda x : test_thread(ui))
    ui.button_clear.clicked.connect(lambda x : clear_output(ui))
    ui.button_screenshot.clicked.connect(lambda x : update_screenshot(ui))
    ui.button_reboot.clicked.connect(lambda x : reboot_equipment(ui))
    ui.buttonGroup.buttonClicked.connect(lambda x : select_siv(ui))

    # Entry behavior
    ui.entry_equipment.textChanged.connect(lambda x : validate_name_input(ui, x))
    ui.entry_serialnumber.textChanged.connect(lambda x : validate_serial_number_input(ui, x))

    # Instance variables
    ui.ip_address = None
    ui.username = None
    ui.password = None
    ui.entry_name_set = False
    ui.entry_serial_number_set = False
    ui.constructor = None
    ui.siv = (ui.buttonGroup.checkedButton()).text()
    ui.label_version.setText(f'Version {APP_VERSION}')

# UI functions
def start_process(ui):
    """
    Launch the process once the start button is pressed.
    """
    convert_sn_to_fqdn(ui)
    # Perform ping test
    if features.test_ping(ui.ip_address):
        write_output(ui, '- Ping OK.')
        ui.progressBar.setProperty('value', 15)
        ui.constructor = find_constructor(ui)
        match ui.constructor:
            case '1':
                write_output(ui, '- Deployment soft 1.')
                write_output(ui, '- Installation.')
            case '2':
                write_output(ui, '- Deployment soft 2.')
                write_output(ui, '- Installation.')
            case _:
                write_output(ui, '- Error : Unknown constructor.')
        if ui.constructor:
            ui.progressBar.setProperty('value', 40)
            status_copy = copy_file(ui, ui.constructor)
            if status_copy == True:
                ui.progressBar.setProperty('value', 70)
                match ui.constructor:
                    case '1':
                        match ui.siv:
                            case 'a':
                                param_install = 'stuff_a'
                            case 'b':
                                param_install = 'stuff_b'
                        features.snmpset(ui.ip_address, '%OID%', param_install)
                        features.snmpset(ui.ip_address, '%OID', '1')
                    case '2':
                        match ui.siv:
                            case 'a':
                                param_install = 'stuff_ab'
                            case 'b':
                                param_install = 'stuff_bb'
                        # Set SNMP stuff
                        features.snmpset(ui.ip_address, '%OID%', 'X')
                        features.snmpset(ui.ip_address, '%OID%', '1')
                        # Tempo 5s
                        time.sleep(5)
                        # Set other SNMP stuff
                        features.snmpset(ui.ip_address, '%OID%', param_install)
                        features.snmpset(ui.ip_address, '%OID%', '1')
                write_output(ui, '- Copy finished, wait until the end of the installation on the equipment.')
                write_output(ui, '- A check of the installation status will be performed in 60 seconds.')
                time.sleep(60)
                result_install = features.snmpget_result_install(ui.ip_address, ui.constructor)
                if 'OK' in result_install:
                    write_output(ui, '- Installation successful')
                elif 'KO' in result_install:
                    write_output(ui, '- Installation failed')
                else:
                    i = 1
                    # Check installation status every 10 seconds for 1 minute in case it takes longer
                    while i != 6 and result_install == '':
                        time.sleep(10)
                        write_output(ui, f'- Installation still ongoing. Please wait. {i}/6')
                        result_install = features.snmpget_result_install(ui.ip_address, ui.constructor)
                        i += 1
                    if i == 6:
                        write_output(ui, '- Installation corrupted')
                    elif 'OK' in result_install:
                        write_output(ui, '- Installation successful')
                    else:
                        write_output(ui, '- Installation failed')
                ui.button_screenshot.setEnabled(True)
                ui.button_reboot.setEnabled(True)
                update_screenshot(ui)
            else:
                write_output(ui, '- Deplyment error')
            ui.progressBar.setProperty('value', 100)
    else:
        write_output(ui, f'- Ping KO. {ui.ip_address}')
        ui.progressBar.setProperty('value', 100)
        features.send_artium_response(
            sn=ui.entry_serialnumber.text(),
            dauphine=ui.entry_equipment.text(),
            cp=os.getlogin(),
            constructor=ui.constructor,
            result='KO - Connection failed'
        )

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    app.setApplicationName('%NAME')
    window = QtWidgets.QMainWindow()
    ui = Ui_Window()
    ui.setupUi(window)
    set_ui(ui)

    # Move window to the center of the screen
    frame_geometry = window.frameGeometry()
    center_position = QtWidgets.QDesktopWidget().availableGeometry().center()
    frame_geometry.moveCenter(center_position)
    window.move(frame_geometry.topLeft())
    window.show()
    sys.exit(app.exec_())

备注：内容来源于stack exchange，提问作者Gaellone