["python","python-asyncio","python-3.5"]
"Asyncio Event Loop is Closed" when getting loop

When trying to run the asyncio hello world code example given in the docs: import asyncio async def hello_world(): print("Hello World!") loop = asyncio.get_event_loop() # Blocking call which returns when the hello_world() coroutine is done loop.run_until_complete(hello_world()) loop.close() I get the error: RuntimeError: Event loop is closed I am using python 3.5.3.
You have already called loop.close() before you ran that sample piece of code, on the global event loop: >>> import asyncio >>> asyncio.get_event_loop().close() >>> asyncio.get_event_loop().is_closed() True >>> asyncio.get_event_loop().run_until_complete(asyncio.sleep(1)) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/.../lib/python3.6/asyncio/base_events.py", line 443, in run_until_complete self._check_closed() File "/.../lib/python3.6/asyncio/base_events.py", line 357, in _check_closed raise RuntimeError('Event loop is closed') RuntimeError: Event loop is closed You need to create a new loop: loop = asyncio.new_event_loop() You can set that as the new global loop with: asyncio.set_event_loop(asyncio.new_event_loop()) and then just use asyncio.get_event_loop() again. Alternatively, just restart your Python interpreter, the first time you try to get the global event loop you get a fresh new one, unclosed. As of Python 3.7, the process of creating, managing, then closing the loop (as well as a few other resources) is handled for you when use asyncio.run(). It should be used instead of loop.run_until_complete(), and there is no need any more to first get or set the loop.