about 'setattr(o, name, value)' and 'inspect.signature(f)'

[Paul Moore]

Agreed. I was being lazy and didn't check precisely which exception
was raised before writing the code. "Making this code production ready
is left as an exercise for the reader" :-)

On 11 October 2017 at 01:59, Steve D'Aprano <steve+python at pearwood.info> wrote:
> On Wed, 11 Oct 2017 02:15 am, Paul Moore wrote:
>
>> These are all run-time behaviours, and so there's no way you can check
>> for them ahead of time. If you want to be sure setattr is allowed, you
>> need to handle possible exceptions:
>>
>>     try:
>>         setattr(o, name, value)
>>     except Exception:
>>         # deal with the problem
>
>
> I would say that you should only catch AttributeError here. Anything else is,
> in my opinion, a bug in the object o that needs to be spotted and fixed.
>
> Even catching AttributeError is a bit... suspicious. Why exactly are we trying
> to attach attributes to arbitrary objects like None or "Hello World"?
>
> But certainly if you get something like UnicodeDecodeError or ImportError from
> trying to set an attribute, that's a bug in o.__setattr__ that needs fixing.
>
>
> --
> Steve
> “Cheer up,” they said, “things could be worse.” So I cheered up, and sure
> enough, things got worse.
>
> --
> https://mail.python.org/mailman/listinfo/python-list