[Numpy-discussion] Numpy and PEP 343
Tim Hochberg
tim.hochberg at cox.net
Tue Feb 28 15:20:03 CST 2006
Tim Hochberg wrote:
[SNIP]
Ugh. This last part got mangled somehow.
>
>
> [1] Here's an example that fakes with and tests deferral:
>
>
>
> import sys
>
> class deferral:
> frames = set()
> def __enter__(self):
> self.frame = sys._getframe(1)
> self.frames.add(self.frame)
> def __exit__(self, *args):
> self.frames.discard(self.frame)
> self.frame = None
> def should_defer():
> return (sys._getframe(1) in deferral.frames)
>
[This got all jammed together, sorry]
> def f(n):
> if not n:
> return
> if n % 4:
> print "should_defer() =", should_defer(), "for n =", n
> f(n-1)
> else:
> # This is a rough translation of:
> # with deferral():
> # print "should_defer() =", should_defer(), "in f"
> # g(n-1)
> d = deferral()
> d.__enter__()
> try:
> print "should_defer() =", should_defer(), "for n =", n
> f(n-1)
> finally:
> d.__exit__(None, None, None)
>
>
> f(10)
>
>
>
>
>
>
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