在PyQt中正确使用QThread的示例?

I'm trying to learn how to use QThreads in a PyQt Gui application. I have stuff that runs for a while, with (usually) points where I could update a Gui, but I would like to split the main work out to its own thread (sometimes stuff gets stuck, and it would be nice to eventually have a cancel/try again button, which obviously doesn't work if the Gui is frozen because the Main Loop is blocked).I'm trying to learn how to use QThreads in a Py