[Python-ideas] AtributeError inside __get__

[Zahari]

> So here's a two-part proposal that would solve Zaheri's problem: 
>
> 1) Enhance AttributeError to include arguments for the parts in 
> quotes, for i18n independence. 
> 2) Provide, in the docs, a hasattr replacement that checks the exception's 
> args. 
>
> The new hasattr would look like this: 
>
> def hasattr(obj, name): 
>     try: 
>         getattr(obj, name) 
>         return True 
>     except AttributeError as e: 
>         if e.args[1] == obj.__class__.__name__ and e.args[2] == name: 
>             return False 
>         raise 
>
> Since it's just a recipe in the docs, you could also have a version 
> that works on current Pythons, but it'd need to do string manipulation 
> to compare - something like: 
>
> def hasattr(obj, name): 
>     try: 
>         getattr(obj, name) 
>         return True 
>     except AttributeError as e: 
>         if e.args[0] == "%r object has no attribute %r" % ( 
>                 obj.__class__.__name__, name): 
>             return False 
>         raise 
>
> I can't guarantee that this doesn't get some edge cases wrong, eg if 
> you have weird characters in your name. But it'll deal with the normal 
> cases, and it doesn't need any language changes - just paste that at 
> the top of your file. 
>
> Zaheri, would this solve your problem? 
>

This looks like a good idea. Note that there is also getattr(X(), 'y', 
'default') that would have to behave like this.

Cheers,

Zahari

 

>
> ChrisA 
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