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I've never bothered to learn Python asyncio. When Python 3.5 came out I just thought it looked overly complex. Coming from a C/C++ background on Linux I just use the select package for waiting on blocking I/O, mainly sockets. Do you think there is something to gain for me by learning asyncio?

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Personally, I don't think there is a benefit. If select is working for you, asyncio doesn't add anything performance wise. It is just meant to look more synchronous in how you write the code. But, using select and either throwing work onto a background thread or doing work quickly (if it isn't CPU bound) can be just as clear to read, if not clearer. Sometimes "async" and "await" calls only obfuscate the logic more.

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