On Fri, Feb 26, 2021 at 5:05 AM Irit Katriel email@example.com wrote:
I'm not sure it's safe to assume that it is necessarily a programming error, and that the interpreter can essentially break the program in this case. Is this not allowed?
try: try: obj.func() # function that raises ExceptionGroups except AttributeError: logger.info("obj doesn't have a func") except *(AttributeError, SyntaxError): logger.info("func had some problems")
I'd be fine with disallowing that. The intuition is that things will be simplest if ExceptionGroup is kept as transparent and meaningless as possible, i.e. ExceptionGroup(ValueError) and ValueError mean exactly the same thing -- "some code inside this block raised ValueError" -- and ideally should be processed in exactly the same way. (Of course we can't quite achieve that due to backcompat issues, but the closer we can get, the better, I think?)
If you need to distinguish between the AttributeError from 'obj.__getattr__("func")' vs the AttributeError from the call to func(), then there's already an obvious way to do that, that works for all functions, not just ones that happen to raise ExceptionGroups:
try: f = obj.func except AttributeError: ... try: f() except ...: # or except *...: ...