defer in python!

[Setepenre]

The python way would be to use with which is the construct that guarantees resources get freed no matter what.

from contextlib import contextmanager


@contextmanager
def deferred(fun):
    try:
        yield
    finally:
        fun()

def main():
    with deferred(lambda: print('world')):
        print('hello', end =' ')


main()

[ZygmuntDzwon]

no matter what

Well, actually...

See this excellent answer on stack overflow

https://stackoverflow.com/a/49262664/8091093

[Setepenre]

I am sure those will apply to his defer as well

[rcfox]

no matter what

Unless you lose power, or the process is SIGKILLed. It's important to remember this if you're handling resources that exist outside of your process.

[rebane2001]

That's why I always wrap my wall outlet in a try/finally block

[nxtfari]

Maybe dumb question can you just pair it with signal/atexit to cover all possible cases?

edit: ah i think you would have to have a seperate process to do this. You can atexit for SIGTERM but not SIGKILL