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kylewu on 04/13/11

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Last Edited at 04/13/11 07:23am

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decorator accepts any argument

/ Published in: Python

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def decorator_with_args(decorator_to_enhance) :
    """ 
    This function is supposed to be used as a decorator.
    It must decorate an other function, that is intended to be used as a decorator.
    Take a cup of coffee.
    It will allow any decorator to accept an arbitrary number of arguments,
    saving you the headache to remember how to do that every time.
    """

# We use the same trick we did to pass arguments
    def decorator_maker(*args, **kwargs) :

# We create on the fly a decorator that accepts only a function
        # but keeps the passed arguments from the maker .
        def decorator_wrapper(func) :

# We return the result of the original decorator, which, after all, 
            # IS JUST AN ORDINARY FUNCTION (which returns a function).
            # Only pitfall : the decorator must have this specific signature or it won't work :
            return decorator_to_enhance(func, *args, **kwargs)

return decorator_wrapper

return decorator_maker

URL: http://stackoverflow.com/questions/739654/understanding-python-decorators

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