def join(self, timeout=None):"""Wait until the thread terminates. 等待線程終止。This blocks the calling thread until the thread whose join() method iscalled terminates -- either normally or through an unhandled exceptionor until the optional timeout occurs.這會阻塞調(diào)用線程，直到其join（）方法被調(diào)用的線程終止（正常或通過未處理的異常終止），或直到發(fā)生可選的超時為止。When the timeout argument is present and not None, it should be afloating point number specifying a timeout for the operation in seconds(or fractions thereof). As join() always returns None, you must callisAlive() after join() to decide whether a timeout happened -- if thethread is still alive, the join() call timed out.如果存在timeout參數(shù)而不是None，則它應(yīng)該是一個浮點數(shù)，以秒（或其分?jǐn)?shù)）指定操作的超時時間。 由于join（）始終返回None，因此必須在join（）之后調(diào)用isAlive（）來確定是否發(fā)生超時-如果線程仍處于活動狀態(tài)，則join（）調(diào)用將超時。When the timeout argument is not present or None, the operation willblock until the thread terminates.當(dāng)不存在超時參數(shù)或timeout==None，該操作將阻塞直到線程終止。A thread can be join()ed many times.一個線程可以被多次join（）。join() raises a RuntimeError if an attempt is made to join the currentthread as that would cause a deadlock. It is also an error to join() athread before it has been started and attempts to do so raises the sameexception.如果嘗試加入當(dāng)前線程，join（）可能會引發(fā)RuntimeError，因為可能導(dǎo)致死鎖。 在啟動線程之前join（）一個線程也是錯誤的，嘗試這樣做會引發(fā)相同的異常。"""if not self._initialized:raise RuntimeError("Thread.__init__() not called")if not self._started.is_set():raise RuntimeError("cannot join thread before it is started")if self is current_thread():raise RuntimeError("cannot join current thread")if timeout is None:self._wait_for_tstate_lock()else:# the behavior of a negative timeout isn't documented, but# historically .join(timeout=x) for x<0 has acted as if timeout=0# 沒有記錄負(fù)超時的行為，但是歷史上.x（0）的.join（timeout = x）表現(xiàn)為超時= 0self._wait_for_tstate_lock(timeout=max(timeout, 0))

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