> 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 > _______________________________________________ > Python-ideas mailing list > python...@python.org <javascript:> > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
_______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
