On Sep 27, 2019, at 10:15, MRAB <pyt...@mrabarnett.plus.com> wrote: > >> On 2019-09-27 17:05, Steven D'Aprano wrote: >> >> 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'?
There is a difference here: if some class defines __getitem__ = None, blocks it from looking like a subscriptable type. That idiom is used for other things like __hash__, even if it’s not used 100% consistently for all protocols. _______________________________________________ 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/FBWRI6GQ2LZ64LADQOVFFKWRNFWYEZOX/ Code of Conduct: http://python.org/psf/codeofconduct/
