How to rewrite this regular function with Deferred-style?
def getCachedResult(cache, key):
try:
item = cache.open(key)
except NotFound:
return None
try:
if item.obsolete():
return None
data = item.read()
finally:
item.release()
result = renew(data)
return result
Conditions:
1. 'cache.open' and 'item.read' become deffered
2. 'item.obsolete()' and 'renew(data)' are not deferred
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