[Python-3000] PEP 3100 Comments

[Barry Warsaw]

On Mon, 2006-05-08 at 09:47 -0600, Steven Bethard wrote:
> On 5/8/06, Barry Warsaw <barry at python.org> wrote:
> > Perhaps then, if we get rid of callable()/PyCallable_Check() it would be
> > useful to add a NotCallableError (as a subclass of TypeError?) that
> > would get thrown should you try to call something that's not callable.
> > The argument to the exception would be the thing you tried to
> > erroneously called.
> 
> +1.  It'd certainly be nice to be able to tell the difference between
> the following two TypeErrors:
> 
>     >>> def s():
>     ...     raise TypeError()
>     ...
>     >>> 's'()
>     Traceback (most recent call last):
>       File "<interactive input>", line 1, in ?
>     TypeError: 'str' object is not callable
>     >>> s()
>     Traceback (most recent call last):
>       File "<interactive input>", line 1, in ?
>       File "<interactive input>", line 2, in s
>     TypeError

BTW, this is something we could add for Python 2.x if we wanted to.
Since NotCallableError would be a subclass of TypeError, all existing
code should continue to work.

-Barry

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