[Python-Dev] PEP 362 Third Revision

[Antoine Pitrou]

On Wed, 13 Jun 2012 22:52:43 -0400
Yury Selivanov <yselivanov.ml at gmail.com> wrote:
> * is_implemented : bool
>     True if the parameter is implemented for use.  Some platforms
>     implement functions but can't support specific parameters
>     (e.g. "mode" for ``os.mkdir``).  Passing in an unimplemented
>     parameter may result in the parameter being ignored,
>     or in NotImplementedError being raised.  It is intended that
>     all conditions where ``is_implemented`` may be False be
>     thoroughly documented.

I don't understand what the purpose of is_implemented is, or how it is
supposed to be computed.

> * bind(\*args, \*\*kwargs) -> BoundArguments
>     Creates a mapping from positional and keyword arguments to
>     parameters.  Raises a ``BindError`` (subclass of ``TypeError``)
>     if the passed arguments do not match the signature.

Why a dedicated exception class? TypeError is good enough, and the
proliferation of exception classes is a nuisance.

Regards

Antoine.