Eventually I found an answer in this thread. The method I was looking for is run_in_executor. This allows a synchronous function to be run asynchronously without blocking an event loop.
In the sleep
example I posted above, it might look like this:
import asyncio
from time import sleep
async def sleep_async(loop, delay):
# None uses the default executor (ThreadPoolExecutor)
await loop.run_in_executor(None, sleep, delay)
return 'I slept asynchronously'
Also see the following answer -> How do we call a normal function where a coroutine is expected?