How to make python await for "nothing", running the event loop first

Question

I run a python program which is run by network events and cannot go 10-15 seconds without processing heartbeats. (More specifically, I use discord.py with a pretty large volume of events)

In one of the possible scenarios I could have a command store a large amount of data into a database, this could potentially take up more than those 10 to 15 seconds, and is blocking.

These are thousands of small database calls where I could make the asynchronous event loop "run its course" in between those calls if needed. How can I make python "await for nothing" in this case?

A similair hack would be to await for a resolved Promise in JavaScript, which throws the process back into the event loop, resolving more pressing events first.

Mikhail Gerasimov · Accepted Answer · 2019-08-04 19:38:59Z

9

await asyncio.sleep(0) - is a way to return control to an event loop.

Although instead of constantly calling it you may go another way: run your blocking code in another thread using run_in_executor and awaiting for it to be finished. This way event loop will normally continue it's course while blocking stuff being processed in background thread.

answered Aug 4, 2019 at 19:38

Mikhail Gerasimov

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