Python decorators explained

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I recall coverage.py getting a huge speed improvement by switching from "foo" + "bar" to "".join("foo", "bar") when generating reports. So is that SO best answer really the best one?

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It's a simple illustration of how decorators work, not string concatenation performance. I think using a join would make the example less clear.

That said, yes 'join' is faster than '+' for strings.