Comment by throwawaymaths a day ago
> But I guess it's going to be 2 params from now on.
>> So, if you discover that a code path you previously thought was pure actually does need to perform IO, then you don't need to apply some nasty viral change; you just grab `my_thing.io
But the asyncio event loop is not reentrant, so your faux sync functions cannot be safely called from other async functions. It is an extremely leaky abstraction. This is not a theoretical possibility, I stumbled on the issue 15 minutes into my foray into asyncio (turns out that jupyter notebooks use asyncio internally).
There are ways around that (spawn a separate thread with a dedicated event loop, then block), or monkey patch asyncio, but they are all ugly.
except you cant "pass the same event loop in multiple locations". its also not an easy lift. the zig std will provide a few standard implementations which would be trivial to drop in.
hm maybe. i guess ive only used python in situations where it injects it into amain so i could have been confused. i thought python async was a wrapper around generators, and so the mechanism cant be instantiated in multiple places. i stand corrected.
Python, for example, will let you call async functions inside non-async functions, you just have to set up the event loop yourself. This isn't conceptually different than the Io thing here.