ExitStack() already covers the "null ctx mgr" use case described in the first message. Original example:


with transaction or contextlib.null():
    ...


By using ExitStack:


with transaction or ExitStack():
    ...


You can push this further and do this, which is even more flexible:


with ExitStack() as stack:
    if condition:
        stack.enter_context(transaction)
    ...


So ExitStack really is better than the original proposal which could have made sense 6 years ago but not anymore.