[Python-ideas] Arguments to exceptions

Ken Kundert python-ideas at shalmirane.com
Mon Jul 3 19:58:21 EDT 2017

    My primary concern is gaining access to the components that make up the 
messages. I am not hung up on the implementation. I just proposed the minimum 
that I thought would resolve the issue and introduce the least amount of risk.

Concerning MRAB's idea of making the named arguments attributes, I am good with 
it.  I considered it, though I was thinking of using __getattr__(), but thought 
that perhaps it was a step to far for the BaseException.


On Tue, Jul 04, 2017 at 12:04:16AM +0100, MRAB wrote:
> Maybe exceptions could put any keyword arguments into the instance's
> __dict__:
>     class BaseException:
>         def __init__(self, *args, **kwargs):
>             self.args = args
>             self.__dict__.update(kwargs)
> You could then raise:
>     raise NameError('name {!a} is not defined', name='foo')
> and catch:
>     try:
>         ...
>     except NameError as e:
>         print('{}: nicht gefunden.'.format(e.name))

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