PyQt - start a loop inside the GUI

Question

I have Python code with some while loop, but I don’t know how to make it work with my PyQt GUI - I can only run a Qt window or this loop (but then the windows do not show). Are there any solutions? I read about some QThreads or QTimers, but I don't know how to use it.

Answer 1

The question is, which is very similar to yours, Background thread with QThread in PyQt . The answer contains 3 unique methods of using qthread .

This tutorial can be very useful, http://joplaete.wordpress.com/2010/07/21/threading-with-pyqt4/

Here is also a very good example:

 import sys import urllib2 from PyQt4 import QtCore, QtGui class 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('%s\n%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', 'https://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_()) 

Hence Update GUI Elements in MultiThreaded PyQT