On 2/9/06, Valentino Volonghi aka Dialtone <dialtone at divmod.com> wrote:
> Let's consider this piece of code (actual code that works today and uses
> twisted for convenience):
>
> def do_stuff(result):
> if result == 'Initial Value':
> d2 = work_on_result_and_return_a_deferred(result)
> d2.addCallback(println)
> return d2
> return 'No work on result'
>
> def println(something):
> print something
>
> d1 = some_operation_that_results_in_a_deferred()
> d1.addCallback(do_stuff)
> d1.addCallback(lambda _: reactor.stop())
>
> reactor.run()
PEP 342 provides a much better alternative:
def do_stuff():
result = (yield some_operation())
something = (yield work_on_result(result))
print something
reactor.stop() # Maybe unnecessary?
reactor.run(do_stuff())
Apparantly it's already been applied to Python 2.5:
http://www.python.org/dev/doc/devel/whatsnew/node4.html
Now that may not be the exact syntax that Twisted provides, but the
point is that the layout (and the top-to-bottom execution order) is
possible.
--
Adam Olsen, aka Rhamphoryncus
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