pyqt中的异步模式?或者更清晰的背景呼叫模式?

I'm trying to write a short(one file pyqt) program which is responsive(so dependencies outside python/lxml/qt, especially ones I can't just stick in the file have some downsides for this use case but I might still be willing to try them). I'm trying to perform possibly lengthy(and cancelable) operations on a worker thread(actually the background operation has a lock around it to prevent multiple operations at once(since the library it uses can only be used one call at a time) and timeouts so spawning multiple threads would be fine also).I'm trying to write a short(one file pyqt) prog