On 16 Dec 2013 02:58, "Ethan Furman" <et...@stoneleaf.us> wrote:
>
> On 12/14/2013 07:51 PM, Steven D'Aprano wrote:
>>
>> On Sun, Dec 15, 2013 at 11:25:10AM +1000, Nick Coghlan wrote:
>>
>>> Oh, yes, a %T shortcut for "length limited type name of the supplied
>>> object" would be brilliant. We need this frequently for C level error
>>> messages, and I almost always have to look at an existing example to
>>> remember the exact incantation :)
>>
>>
>> What are the chances that could be made available from pure Python too?
>> Having to extract the name of the type is a very common need for error
>> messages, and I never know whether I ought to write type(obj).__name__
>> or obj.__class__.__name__. A %T and/or {:T} format code could be the One
>> Obvious Way to include the type name in strings
>
>
> +1It's less obviously correct for Python code, though. In C, we're almost always running off slots, so type(obj).__name__ has a very high chance of being what we want, and is also preferred for speed reasons (since it's just a couple of pointer dereferences). At the Python level, whether to display obj.__name__ (working with a class directly), type(obj).__name__ (working with the concrete type, ignoring any proxying) or obj.__class__.__name__ (which takes proxying into account) really depends on exactly what you're doing, and the speed differences between them aren't so stark. Cheers, Nick. > > -- > ~Ethan~ > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ncoghlan%40gmail.com
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