class-based class decorator

Jean-Michel Pichavant jeanmichel at
Tue Jan 13 17:37:25 CET 2015

----- Original Message -----
> From: "Albert-Jan Roskam" <fomcl at>
> > From: Jean-Michel Pichavant <jeanmichel at>
> > I don't really understand how you successfuly manage positional
> > parameters,
> > since the caller may not name them.
> > I'm asking because if your intend to check only the keyword
> > parameters,
> > there's a much simplier solution.
> > 
> > JM
> Hi,
> Can you give an example of where/how my code would fail? I do not
> intend to use *args and **kwargs, if that is what you mean. I am
> interested in hearing a simpler approach, especially if it would
> also solve the messed-up-signature problem that I mentioned.
> Thank you!
> Albert-Jan

In the example you've given you've deprecated only keyword arguments. So I was wondering...

would the following *untested* code work ? :

def check_deprecated_args(deprecated):
  def decorator(func):
    def inner(*args, **kwargs):
      for p in deprecated:
        if p in kwargs:
          print '%s is deprecated' % p
      return func(*args, **kwargs)
    return inner
  return decorator



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