On Sun, Dec 4, 2022 at 11:08 AM Chris Angelico <[email protected]> wrote:
>
>
> You're not the first to try to use globals() for this, but it means
> that the context manager works ONLY at top-level.
>
I agree with most criticism of this proposal, although I'll note that the
one place where I'd like something like this is at top level. I often write
something like this at top level:
__part1 = (some calculation)
__part2 = (some other calculation)
THING = combine(__part1, __part2)
__part1 = __part2 = None
If they are large objects and I forget to explictly delete the references,
then they won't be garbage collected. Yes, this trivial example could be
folded into a single line but that makes it much harder to understand what
it's doing. And often those calculations are more complex and can't be
written on one line. I can put that in a function which still leaves the
function in scope:
def __create_thing():
part1 = (some calculation)
part2 = (some other calculation)
return combine(part1, part2)
THING = __create_thing()
If we had a top-level-only local statement, I might use it but note that
it's still clumsy since I have to make THING non-local:
local:
part1 = (some calculation)
part2 = (some other calculation)
nonlocal THING
THING = combine(part1, part2)
The often-rejected multi-line lambda might be better except those parens at
the end are easy to miss:
THING = (lambda:
part1 = (some calculation)
part2 = (some other calculation)
return combine(part1, part2))()
Looking at all these options, is the cost of adding anything actually worth
the benefit? Probably not.
--- Bruce
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