Steven D'Aprano writes:
> I have a script that can be broken up into four subtasks. If any of
> those subtasks fail, I wish to exit with a different exit code and
> error.
>
> Assume that the script is going to be run by system administrators who
> know no Python and are terrified of tracebacks, and that I'm logging
> the full traceback elsewhere (not shown).
>
> I have something like this:
>
>
> try:
> begin()
> except BeginError:
> print("error in begin")
> sys.exit(3)
>
> try:
> cur = get_cur()
> except FooError:
> print("failed to get cur")
> sys.exit(17)
>
> try:
> result = process(cur)
> print(result)
> except FooError, BarError:
> print("error in processing")
> sys.exit(12)
>
> try:
> cleanup()
> except BazError:
> print("cleanup failed")
> sys.exit(8)
>
>
>
> It's not awful, but I don't really like the look of all those
> try...except blocks. Is there something cleaner I can do, or do I just
> have to suck it up?
Have the exception objects carry the message and the exit code?
try:
begin()
cur = get_cur()
result = process(cur)
print(result)
cleanup()
except (BeginError, FooError, BarError, BazError) as exn:
print("Steven's script:", message(exn))
sys.exit(code(exn))
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