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Run your program under the debugger, when the GUI is blocked, interrupt the application (e.g. Ctrl+C when using gdb) and see what the top frame of the main thread is. That's your blocking call. You can trace it down to your code by checking lower frames (printing a backtrace is the simplest way to do this). 一个QThread对象管理一个程序中的控制线程.QThread在run()中开始执行任务.默认地,run() ... pyqt4：在线程Qthread中使用定时器Qtimer. GUI main 部分,主app类中的__init__初始化方法中添加 实例化线程 self.s2_thread=Worker2() 初始化一个定时器 self.log_get=QtCore.QTim ... Qt QThread 多线程使用. Rob, a quick question. I saw your helpful post of PyQt and read through your code. I'm unfamiliar with the use of result=self.displayPrime on line 26. I assume this is the equivalent of self.result.connect(GUI.displayPrime), but wondered if you had a hyperlink so I could read more about this (nice) syntax? Thanks!.