Python 3.11: A Guided Tour Through Code Transcripts
Chapter: Concurrency Improvements
Lecture: AsyncIO Timeout Context Manager
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Here's a quick one. We'll just look at the docks. A time out context manager. So whenever you're talking to external systems that might time out,
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I'm waiting for the database to respond, I put something in the queue,
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I'm waiting for a response to be put into another queue after it's been processed. How long do you have to wait for that? Usually not too long.
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Sometimes a long time, potentially forever walking up your system,
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which is not ideal. So one of the additions we get is the asyncio.timeout context manager
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So in this case if we have some asynchronous task here represented by the long running task,
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async method And we want to run it for only 10 seconds and any longer than that becomes an error We just say async with asyncio time out 10.
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Put that into the context manager and either it's going to come out successfully or there's going to be an exception
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and it will be canceled. This will show up normally as a cancelation error or canceled error but the context
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manager will transform all canceled errors into time out errors,
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which you can handle as a special case. So there's a specific exception you're going to be able to handle
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that says the thing you try to do timed out through this async time out mechanism.
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Pretty cool. Check it out if that sounds useful. Here is the real easy way to do it in python 311.