If you don't like that construct, perhaps this one is nicer:from twisted.internet.defer import maybeDeferred def getCachedResult(cache, key): def _readItem(item): if item.obsolete(): return None return item.read() def _gotResult(item): def _release(ign): item.release() return item d = maybeDeferred(_readItem, item) d.addBoth(_release) d.addCallback(renew) return d def _ebNotFound(f): f.trap(NotFound) return None return cache.open(key).addCallbacks(_gotResult, _ebNotFound
Thanks, this is what I was looking for
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