λ cat xxx.py import asyncio async def f(): await asyncio.sleep(0) async def g(): await asyncio.gather(f(), f()) h = g() h.send(None) print(type(h)) h.throw(ValueError("some error"), None, None) λ python3.10 xxx.py /Users/shantanu/dev/cpython/xxx.py:5: DeprecationWarning: There is no current event loop await asyncio.gather(f(), f()) <class 'coroutine'> Traceback (most recent call last): File "/Users/shantanu/dev/cpython/xxx.py", line 10, in <module> h.throw(ValueError("some error"), None, None) File "/Users/shantanu/dev/cpython/xxx.py", line 5, in g await asyncio.gather(f(), f()) ValueError: some error λ python3.11 xxx.py /Users/shantanu/dev/cpython/xxx.py:5: DeprecationWarning: There is no current event loop await asyncio.gather(f(), f()) <class 'coroutine'> Traceback (most recent call last): File "/Users/shantanu/dev/cpython/xxx.py", line 10, in <module> h.throw(ValueError("some error"), None, None) File "/Users/shantanu/dev/cpython/xxx.py", line 5, in g await asyncio.gather(f(), f()) TypeError: throw() third argument must be a traceback