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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