decorators and closures

[Andrea Crotti]

With one colleague I discovered that the decorator code is always 
executed, every time I call
a nested function:

def dec(fn):
    print("In decorator")
    def _dec():
        fn()
    return _dec

def nested():
    @dec
    def fun():
        print("here")

nested()
nested()

Will give:
In decorator
In decorator

So we were wondering, would the interpreter be able to optimize this 
somehow?
I was betting it's not possible, but I'm I would like to be wrong :)
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