Mastering GUI Programming with Python

Adding threads

A thread is an independent code execution context. By default, all of our code runs in a single thread, so we refer to it as a single-threaded application. Using the QtCore.QThread class, we can create new threads and move portions of our code to them, making it a multithreaded application.

You can use the QThread object as follows:

        self.searcher_thread = qtc.QThread()        self.ss.moveToThread(self.searcher_thread)        self.ss.finished.connect(self.searcher_thread.quit)        self.searcher_thread.start()

We start by creating a QThread object, and then use the SlowSearcher.moveToThread() method to move our SlowSearcher object to the new thread. moveToThread() is a QObject method inherited by any class that subclasses QObject.

Next, we connect ...