Do be aware that https://docs.python.org/3.9/library/contextlib.html#contextlib.nullcontext https://docs.python.org/3.9/library/contextlib.html#contextl... also

Do be aware that https://docs.python.org/3.9/library/contextlib.html#contextlib.nullcontext https://docs.python.org/3.9/library/contextlib.html#contextl... also exists as of 3.7 -- you can do ctx_mgr = foo() if bar else nullcontext() with ctx_mgr: ... if you like.