class-based class decorator

[Jean-Michel Pichavant]

----- Original Message -----
> From: "Albert-Jan Roskam" <fomcl at yahoo.com.dmarc.invalid>
> import functools
> import inspect
> import warnings
> 
> warnings.simplefilter("always")
> 
> class check_deprecated_args(object):
> 
>     def __init__(self, deprecated_params, msg=None):
>         self.deprecated_params = deprecated_params
>         self.msg = msg
> 
>     def __call__(self, func):
>         @functools.wraps(func)
>         def inner(*args, **kwargs):
>             argspec = inspect.getargspec(func)
>             default_signature = dict(zip(argspec.args[1:],
>             argspec.defaults))
>             callargs = inspect.getcallargs(func, *args, **kwargs)
>             deprecated_calls = [(p, a) for p, a in callargs.items()
>             if
>                                  p in self.deprecated_params and
>                                  a != default_signature[p]]
>             for (param, arg) in deprecated_calls:
>                 msg = "you're using obsolete parameters in %s:
>                 [%s:%s]"
>                 msg = msg % (func.__name__, param, arg)
>                 msg = msg + " " + self.msg if self.msg else msg
>                 warnings.warn(msg, DeprecationWarning, stacklevel=2)
>             return func(*args, **kwargs)
>         functools.update_wrapper(inner, func)
>         return inner
> 
> if __name__ == "__main__":
>     class Foo(object):
> 
>         @check_deprecated_args(["old", "older"], "use 'brand_new'
>         param instead")
>         def __init__(self, old="old", older="ancient"):
>             print "hello"
> 
>         @check_deprecated_args(deprecated_params=["old", "older"])
>         def bar(self, old="default"):
>             print "world"
> 
>     f = Foo(old="old", older="dino era")
>     f.bar("gnarly")
> 
>     help(f)  # now the signature is *args, **kwargs, which makes my
>     Sphinx documentation less readable!
> 
> Best wishes,
> Albert-Jan

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


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