Other threads can call a thread’s join() method. This blocks the calling thread until the thread whose join() method is called is terminated. Thread Objects threading.Thread.join 阻塞当前调用 thread.join()的进程或者线程，直到join的线程（ the thread whose join() method is called ）结束，才继续执行当前进程或者线程（the calling thread ）~
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不join 主线程结束了你的子线程怎么办
Other threads can call a thread’s join() method. This blocks the calling thread until the thread whose join() method is called is terminated.
Thread Objects
threading.Thread.join
阻塞当前调用 thread.join()的进程或者线程，直到join的线程（ the thread whose join() method is called ）结束，才继续执行当前进程或者线程（the calling thread ）~