On 2019-09-27 17:05, Steven D'Aprano wrote:
I keep finding myself needing to test for objects that support subscripting. This is one case where EAFP is *not* actually easier:try: obj[0] except TypeError: subscriptable = False except (IndexError, KeyError): subscriptable = True else: subscriptable = True if subscriptable: ... But I don't like manually testing for it like this: if getattr(obj, '__getitem__', None) is not None: ... because it is wrong. (Its wrong because an object with __getitem__ defined as an instance attribute isn't subscriptable; it has to be in the class, or a superclass.) But doing it correctly is too painful: if any(getattr(T, '__getitem__', None) is not None for T in type(obj).mro())
[snip] Is there are reason why you're using 'getattr' instead of 'hasattr'? _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/S2YWYTXIRZNO4RB4LJH4LDHJSCFWYW3R/ Code of Conduct: http://python.org/psf/codeofconduct/
