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lang-py
@timerreturnsdecoratorfunction. On the other hand,@timer()will executetimerfirst then returndecoratorwhich in turn used to decoratedecorated.functools.lru_cache, it works as well as many other decorators without explicit calls()lru_cacheis probably not a parametrizable decorator (however, I did not check), but yourtimerdecorator is parametrizable, this is the key point.