Message 343247 - Python tracker

In PR 13490, Thomas Grainger proposed a cool context manager:

@contextlib.contextmanager
def throw_unraisable_exceptions():
    unraisable = None
    old_hook = sys.unraisablehook

    def hook(exc):
        nonlocal unraisable
        unraisable = exc

    sys.unraisablehook = hook
    try:
        yield
        if unraisable is not None:
            raise unraisable
    finally:
        unraisable = None
        sys.unraisablehook = old_hook

It allows to raise an unraisable exception :-D Example:

try:
    with support.throw_unraisable_exceptions():
        ...
except Exception as e:
    ... # the exception is now here

I don't need such context manager right now, but I like the fact that it becomes possible to write such context manager :-)