threading.py 文件源码

def isAlive(self):
        """Return whether the thread is alive.

        This method returns True just before the run() method starts until just
        after the run() method terminates. The module function enumerate()
        returns a list of all alive threads.

        """
        assert self.__initialized, "Thread.__init__() not called"
        return self.__started.is_set() and not self.__stopped