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Groups > comp.lang.python > #16012

decorators and closures

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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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decorators and closures Andrea Crotti <andrea.crotti.0@gmail.com> - 2011-11-21 14:44 +0000
  Re: decorators and closures Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-11-22 03:54 +0000
  Re: decorators and closures 88888 Dihedral <dihedral88888@googlemail.com> - 2011-11-22 09:03 -0800
  Re: decorators and closures 88888 Dihedral <dihedral88888@googlemail.com> - 2011-11-22 09:03 -0800

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