No this is a "bug" in python, you are breaking AsyncIO.

And it's not the context manager its disable("WARN") that is wrong. disable takes int, not str you meant: logging.disable(logging.WARN). Which will work.

$ python foo.py
Traceback (most recent call last):
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/logging/__init__.py", line 1685, in isEnabledFor
    return self._cache[level]
KeyError: 10

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "foo.py", line 17, in <module>
    asyncio.run(main())
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/runners.py", line 39, in run
    loop = events.new_event_loop()
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/events.py", line 758, in new_event_loop
    return get_event_loop_policy().new_event_loop()
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/events.py", line 656, in new_event_loop
    return self._loop_factory()
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/unix_events.py", line 54, in __init__
    super().__init__(selector)
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/selector_events.py", line 59, in __init__
    logger.debug('Using selector: %s', selector.__class__.__name__)
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/logging/__init__.py", line 1421, in debug
    if self.isEnabledFor(DEBUG):
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/logging/__init__.py", line 1689, in isEnabledFor
    if self.manager.disable >= level:
TypeError: '>=' not supported between instances of 'str' and 'int'
Exception ignored in: <function BaseEventLoop.__del__ at 0x1038a65e0>
Traceback (most recent call last):
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/base_events.py", line 656, in __del__
    self.close()
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/unix_events.py", line 58, in close
    super().close()
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/selector_events.py", line 92, in close
    self._close_self_pipe()
  File "/Users/bussonniermatthias/miniconda3/lib/python3.8/asyncio/selector_events.py", line 99, in _close_self_pipe
    self._remove_reader(self._ssock.fileno())
AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
sys:1: RuntimeWarning: coroutine 'main' was never awaited

$ cat foo.py
import asyncio

async def count():
    print("One")
    await asyncio.sleep(1)
    print("Two")

async def main():
    await asyncio.gather(count(), count(), count())

import logging
logging.disable('WARN')

if __name__ == "__main__":
    import time
    s = time.perf_counter()
    asyncio.run(main())
    elapsed = time.perf_counter() - s
    print(f"{__file__} executed in {elapsed:0.2f} seconds.")

You may want to open a bug in CPython.

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with logging.disable('WARN') wrecks IPython #12713

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`with logging.disable('WARN')` wrecks IPython #12713