Introduction
By design asyncio does not allow
its event loop to be nested. This presents a practical problem:
When in an environment where the event loop is
already running it's impossible to run tasks and wait
for the result. Trying to do so will give the error
"RuntimeError: This event loop is already running".
The issue pops up in various environments, such as web servers, GUI applications and in Jupyter notebooks.
This module patches asyncio to allow nested use of asyncio.run and
loop.run_until_complete.
Installation
pip3 install nest_asyncio
Python 3.5 or higher is required.
Usage
import nest_asyncio
nest_asyncio.apply()Optionally the specific loop that needs patching can be given
as argument to apply, otherwise the current event loop is used.
An event loop can be patched whether it is already running
or not. Only event loops from asyncio can be patched;
Loops from other projects, such as uvloop or quamash,
generally can't be patched.