在多线程PyQT中更新GUI元素

这里有一些非常基本的例子。

您可以将对GUI元素的引用传递给线程，并在线程中更新它们。

import sysimport urllib2from PyQt4 import QtCore, QtGuiclass DownloadThread(QtCore.QThread):    def __init__(self, url, list_widget):        QtCore.QThread.__init__(self)        self.url = url        self.list_widget = list_widget    def run(self):        info = urllib2.urlopen(self.url).info()        self.list_widget.addItem('%sn%s' % (self.url, info))class MainWindow(QtGui.QWidget):    def __init__(self):        super(MainWindow, self).__init__()        self.list_widget = QtGui.QListWidget()        self.button = QtGui.QPushButton("Start")        self.button.clicked.connect(self.start_download)        layout = QtGui.QVBoxLayout()        layout.addWidget(self.button)        layout.addWidget(self.list_widget)        self.setLayout(layout)    def start_download(self):        urls = ['http://google.com', 'http://twitter.com', 'http://yandex.ru',     'http://stackoverflow.com/', 'http://www.youtube.com/']        self.threads = []        for url in urls: downloader = DownloadThread(url, self.list_widget) self.threads.append(downloader) downloader.start()if __name__ == "__main__":    app = QtGui.QApplication(sys.argv)    window = MainWindow()    window.resize(640, 480)    window.show()    sys.exit(app.exec_())

编辑者注意：
Qt小部件不是线程安全的，不应从任何线程（主线程）进行访问（有关更多详细信息，请参见Qt文档）。正确使用线程的方法是通过信号/插槽，如答案第二部分所示。

另外，您可以使用信号和插槽来分隔GUI和网络逻辑。

import sysimport urllib2from PyQt4 import QtCore, QtGuiclass DownloadThread(QtCore.QThread):    data_downloaded = QtCore.pyqtSignal(object)    def __init__(self, url):        QtCore.QThread.__init__(self)        self.url = url    def run(self):        info = urllib2.urlopen(self.url).info()        self.data_downloaded.emit('%sn%s' % (self.url, info))class MainWindow(QtGui.QWidget):    def __init__(self):        super(MainWindow, self).__init__()        self.list_widget = QtGui.QListWidget()        self.button = QtGui.QPushButton("Start")        self.button.clicked.connect(self.start_download)        layout = QtGui.QVBoxLayout()        layout.addWidget(self.button)        layout.addWidget(self.list_widget)        self.setLayout(layout)    def start_download(self):        urls = ['http://google.com', 'http://twitter.com', 'http://yandex.ru',     'http://stackoverflow.com/', 'http://www.youtube.com/']        self.threads = []        for url in urls: downloader = DownloadThread(url) downloader.data_downloaded.connect(self.on_data_ready) self.threads.append(downloader) downloader.start()    def on_data_ready(self, data):        print data        self.list_widget.addItem(unipre(data))if __name__ == "__main__":    app = QtGui.QApplication(sys.argv)    window = MainWindow()    window.resize(640, 480)    window.show()    sys.exit(app.exec_())