Marco Sulla writes:
> Maybe it's a crazy idea, but what if we could decorate a single line
> of code?
> For example:
>
> @Timer
> a = time_consuming_function()
As syntax, I don't see the advantage over
with ContextManagingTimer():
a = time_consuming_function()
I don't understand the intended semantics. There's no there there to
decorate. How do you propose to pick the sequence of bytecodes to
decorate? What happens if the're not bytecodes and the machine code
JIT optimizer (think common subexpression elimination) got hold of it
before you decorated it?
> This will be equivalent to using Steven's context manager, but the
> decorator is more simple to comment and uncomment.
To the extent that this abbreviated notation "does" something worth
the needed mucking with decorator semantics, you're going to be doing
it a lot, right? If so, why not tune your ContextManagingTimer to
take a debug argument, store its results in a class attribute, etc,
etc. Seems more straightforward to me.
> Maybe it could be possible to comment also code blocks:
>
> @parallel
> for x in y:
> do_something(x)
> now_something_completely_different(x)
If you can figure out what to decorate a simple statement, I don't see
why you couldn't do it with a compound statement. However, Python has
*suites* (loosely associated sequences of statements), not *blocks*.
Why is that important? Well, suppose you want to identify the x in y
that goes exponentially complex on you:
for x in y:
@ContextManagingTimer # creates a stack of results in Timer.out
do_something(x); now_something_completely_different(x)
but unfortunately we don't have blocks and semicolons don't work like
that.
> This could be a shortcut for multiprocessing.
I don't think there are any shortcuts for multiprocessing. ;-)
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