> One way to satisfy this would be to redefine setdefault something like
> this:
>
> def setdefault(aDict, aKey, aValue=None, lazy=None):
> assert aValue is None or lazy is None
> if aKey not in aDict:
> aDict[aKey] = (if lazy is None: aValue else: lazy())
> return aDict[aKey]
Nice. Nevertheless I keep thinking that current "setdefault" behaviour
is not fully documented and counterintuitive :-). So we would need to
fix the behaviour or update docs :-p
God, you all mutate a fairly simple and concrete consideration into a
broad language "lazy evaluation" feature. I'm overhelmed };-)
> myDict.setdefault(myKey, lazy=lambda:expensive_function(args))
Nice lambda usage: declare a pseudofunction that calls another function
with predefined parameters. Updating my toolbox... :)
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