sys.stdout.flush()
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[73]制造业产品质量合格率是指按照规定的方法、程序和标准实施质量抽样检测，判定为质量合格的样品数占全部抽样样品数的百分比。
Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.