decorators within decorators

[snippsat]

Some point,decorators within decorators with several argument is confusing for most.
I know well how it works,but can really struggle if i haven't look it at for a while.

If you have any docstrings in the decorated function you will lose it. See functools.wraps

Yes this is important,also wrapt take this further.

The wrapt module focuses very much on correctness.
It therefore goes way beyond existing mechanisms such as functools.wraps() to ensure that decorators preserve introspectability,
signatures, type checking abilities etc.

So if i should done anything serious with decorator today i would look into using wrapt
Graham Dumpleton author of wrapt: Hear no evil, see no evil.

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David Beazley Decorators with Arguments.

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Decorators can be useful,two of my favorite Python packages use decorator Flask and Click .
I used Click in my tutorial here
So the user interface get clean by hiding all code that's not needed to be shown,
like cheeking for path with type=click.Path(exists=True).
This also mean that i don't have to write error checking for Path in my code.

@click.command() 
@click.argument('file', type=click.Path(exists=True), metavar='<file>')
def play(file):
   ....