修正不正确的缩进，保持与原版的代码逻辑一致 #201
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itertools.chain(*files)导致gen_opener()生成器被提前全部消费掉，因此在此场景不适合，参见原文https://www.safaribooksonline.com/library/view/python-cookbook-3rd/9781449357337/ch04s13.html。但仍可以用yield from itertools.chain.from_iterable(files)，itertools.chain.from_iterable相对于itertools.chain，它是懒消费的。 见https://stackoverflow.com/questions/15004772/what-is-the-difference-between-chain-and-chain-from-iterable-in-itertools。
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见https://stackoverflow.com/questions/15004772/what-is-the-difference-between-chain-and-chain-from-iterable-in-itertools。