A "scopeguard" for Python

[Alf P. Steinbach]

* Mike Kent:
> What's the compelling use case for this vs. a simple try/finally?

if you thought about it you would mean a simple "try/else". "finally" is always 
executed. which is incorrect for cleanup

by the way, that's one advantage:

a "with Cleanup" is difficult to get wrong, while a "try" is easy to get wrong, 
as you did here


   ---

another general advantage is as for the 'with' statement generally



>    original_dir = os.getcwd()
>    try:
>        os.chdir(somewhere)
>        # Do other stuff

also, the "do other stuff" can be a lot of code

and also, with more than one action the try-else introduces a lot of nesting


>    finally:
>        os.chdir(original_dir)
>        # Do other cleanup


cheers & hth.,

- alf