2 ms·

In particular ExitStacks are useful when you have 0 or 1 resources. It allows a sort of null-context manager for when the number of resources you have to alloc

• hchasestevens 6y ago
  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.
  • BerislavLopac 6y ago
    Or even, from Python 3.8: with (ctx_mgr := foo() if bar else nullcontext()): ...